Question: What is the closest parent taxonomy of this insect?

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Hermetia illucens. Hermetia illucens, the black soldier fly, is a common and widespread fly of the family Stratiomyidae.## Distribution.This species is native to the Neotropical realm, but in recent decades has spread across all continents, becoming virtually cosmopolitan. It is present in most of the United States and Europe, including the Iberian Peninsula, southern France, Italy, Croatia, Malta, the Canary Islands, and Switzerland, on the Black Sea coast of Russia in the Krasnodar Territory. It can also be found in the Afrotropical realm, the Australasian realm, the east Palaearctic realm, the Nearctic realm, North Africa, Southern Africa, and the Indomalayan realm.## Description.The.

Hermetia illucens. adults of "H. illucens" measure about 16 (mm) long. These medium-sized flies have a predominantly black body, with metallic reflections ranging from blue to green on the thorax and sometimes with a reddish end of the abdomen. The second abdominal tergite has translucent areas, from which the specific Latin epithet derives. The head is wide, with very developed eyes. The antennae are about twice the length of the head. The legs are black with whitish tarsi. The wings are membranous; in the resting time, they are folded horizontally on the abdomen and overlapped."H. illucens" is a mimic fly, very close.

Hermetia illucens. in size, color, and appearance to the organ pipe mud dauber wasp and its relatives. The mimicry of this particular kind of wasp is especially enhanced in that the fly's antennae are elongated and wasp-like, the fly's hind tarsi are pale, as are the wasp's, and the fly has two small transparent "windows" in the basal abdominal segments that make the fly appear to have a narrow "wasp waist". Black soldier fly larvae can be differentiated from blowfly or housefly larvae by a thin gray-black stripe on their posterior ends.## Lifecycle.An adult female lays between 206 and 639 eggs at.

Hermetia illucens. a time. These eggs are typically deposited in crevices or on surfaces above or adjacent to decaying matter such as manure or compost and hatch in about 4 days. Freshly emerged larvae are 0.04 (in), being able to reach a length of 1 (in) and weight of 0.10 to 0.22 (g) by the end of larval stage. The larvae are able to feed on a wide variety of organic matter, adapting to diets with different nutrient content. The larval stage lasts from 18 to 36 days, depending on the food substrates provided to the larvae, of which the postfeeding (prepupal).

Hermetia illucens. stage lasts around 7 days. The length of larval stage can be delayed by months due to low temperature or lack of food. The pupal stage lasts from 1 to 2 weeks. Adults can live typically 47 to 73 days when provided with water and food, such as sugar in captivity or nectar in the wild, or survive for about 8 to 10 days on fat reserves gathered during larval stage when water is provided.## Human relevance and use.The larvae and adults are considered neither pests nor vectors. Instead, black soldier fly larvae play a similar role to that of.

Hermetia illucens. redworms as essential decomposers in breaking down organic substrates and returning nutrients to the soil. The larvae have voracious appetites and can be used for composting household food scraps and agricultural waste products.Additionally, black soldier fly larvae (BSFL) are an alternative source of protein for aquaculture, animal feed, pet food and human nutrition.The larvae are produced and processed in industrial-scale insect factories globally by biotechnology companies such as AgriProtein, InnovaFeed and Protix, the latter operating the world's largest insect factory in the Netherlands.## As decomposers / in composting.Black soldier fly larvae (BSFL) are used to compost waste or convert the.

Hermetia illucens. waste into animal feed. The wastes include fresh manure and food wastes of both animal and vegetable origin. Fly larvae are among the most efficient animals at converting biomass into feed.When the larvae have completed their larval development through six instars, they enter a stage called the "prepupa" wherein they cease to eat, and they tend to migrate toward cool, dark, and dry substrates to pupate. This prepupal migration instinct is used by bins to self-harvest the mature larvae. have ramps or holes on the sides to allow the prepupae to climb out of the composter and drop into a.

Hermetia illucens. collection area.Larvae are beneficial in these ways:Their large size relative to houseflies and blowflies allows them to prevent houseflies and blowflies from laying eggs in decaying matter by consuming larvae of other species. This matters because compost systems inhabited by houseflies and blowflies carry a much greater stench than systems inhabited by BSFL, making" H. illucens" a more human-friendly way to minimize food waste.They are not a pest to humans. Unlike houseflies, adult black soldier flies have greatly-reduced sponging mouthparts and can only consume liquids such as flower nectar or do not eat at all. They do not regurgitate food.

Hermetia illucens. along with digestive enzymes like houseflies, thus do not spread diseases.They are not attracted to human habitation or foods. As a detritivore and coprovore, the egg-bearing females are attracted to rotting food or manure.Black soldier flies do not fly around as much as houseflies. They have less expendable energy due to their limited ability to consume food as adults. They are very easy to catch and relocate when they get inside a house, as they do not avoid being picked up, they are sanitary, and they neither bite nor sting. Their only defense seems to be hiding. When using a.

Hermetia illucens. wet grub bin that will collect or kill all the pupae, the black soldier fly population is easy to reduce by killing the pupae/prepupae in the collection container, before they become flies. They may be killed by freezing, drying, manually feeding to domestic animals, putting the collection container in a chicken coop for automatic feeding, or feeding to wild birds with a mouse/pest-proof feeder.Significant reductions of "E. coli" 0157:H7 and" Salmonella enterica" were measured in hen manure after larvae activity was added onto the manure.They quickly reclaim would-be pollutants: Nine organic chemicals were greatly reduced or eliminated from manure in.

Hermetia illucens. 24 hours.They quickly reduce the volume and weight of would-be waste: The larval colony breaks apart its food, churns it, and creates heat, increasing compost evaporation. Significant amounts are also converted to carbon dioxide respired by the grubs and symbiotic/mutualistic microorganisms. BSFL in a compost system typically reduce the volume of compost by around 50%.Aside from the protein production, fly larvae also produce another valuable resource called frass. Fly larval frass is a granulated and odorless residue that can be used as organic fertilizer directly or through conversion by earthworms.Recent research in the field of entomoremediation shows the potential of.

Hermetia illucens. this insect for purification of biomass contaminated with heavy metals.## As feed.Black soldier fly larvae are used as feed. The harvested pupae and prepupae are eaten by poultry, fish, pigs, lizards, turtles, and even dogs. The insect is one of the few insect species approved to be used as feed in aquaculture in the EU.At the pupal stage, black soldier flies are at their nutritional peak. They can be stored at room temperature for several weeks, and their longest shelf life is achieved at 50 to 60 (F).## As human food.Records of human consumption of "Hermetia illucens" are difficult to.

Hermetia illucens. find.In 2013, Austrian designer Katharina Unger invented a table-top insect-breeding farm called "Farm 432" in which people can produce edible fly larvae at home. It is a multichambered plastic machine that looks like a kitchen appliance and can produce 500 (g) of larvae or two meals in a week.The taste of the larvae is said to be very distinctive. Unger: "When you cook them, they smell a bit like cooked potatoes. The consistency is a bit harder on the outside and like soft meat on the inside. The taste is nutty and a bit meaty.## For producing grease.Black soldier fly.

Hermetia illucens. larvae can be used to produce grease. The grease is usable in the pharmaceutical industry (cosmetics, surfactants for shower gel) thereby replacing other vegetable oils such as palm oil, or it can be used in fodder.## For producing chitin.Black soldier fly larvae can be used to produce chitin. Chitin is used in shipping as an alternative against biofouling. It is also used in water purification. Chitin also has a good potential as soil amendment, to improve soil fertility and plant resilience.## In bioremediation.The larvae of "Hermetia illucens" were used in a bioremediation experiment, in which they utilized up to 49%.

Hermetia illucens. of dry weight corn leaves polluted with cadmium or zinc after 36 days. Artificially polluted corn leaves serves here as a model plant material comparable to plant biomass polluted as a result of phytoextraction. The 49% loss of polluted dry weight is a better result than in the case of composting, which is one of the standard proposed pretreatments for biomass polluted after phytoextraction. The type of heavy metal did not affect the degree of utilization. Cadmium mostly accumulates in the puparium, while zinc accumulates in the adult fly.The use of insect for bioremediation is named entomoremediation.## Farming.## Larval colonies.The.

Hermetia illucens. main difficulty is obtaining black soldier fly larvae or eggs to start or replenish the colony. This is usually done by enticing the soldier flies to lay eggs in small holes over the grub bin. Adult flies lay clusters of eggs in the edges of corrugated cardboard or corrugated plastic. In some regions, it is possible to start or maintain adequate larvae colonies from native soldier flies; however, pest species such as houseflies and blowflies are also drawn to many of the foods used to attract soldier flies (such as fermented chicken feed).In tropical or subtropical climates, they might breed.

Hermetia illucens. year-round, but in other climates, a greenhouse may be needed to obtain eggs in the cooler periods. The grubs are quite hardy and can handle more acidic conditions and higher temperatures than redworms. Larvae can survive cold winters, particularly with large numbers of grubs, insulation, or compost heat (generated by the microorganisms in the grub bin or compost pile). Heat stimulates the grubs to crawl off, pupate, and hatch, and a great deal of light and heat seem to be required for breeding. Many small-scale grub farmers build their larval colonies from eggs deposited by wild soldier flies.## Space and.

Hermetia illucens. shape.Newly emerged soldier flies perform the beginning of their mating ritual in flight. The male grabs onto the female, and then grasps the female's ovipositor with his genitals. They mate while stationary and connected.German scientists have successfully bred soldier flies in a space as small as 10 liters.## Heat.Adults typically mated and oviposited at temperatures of 24 to 40 (C) or more. Around 99.6% of oviposition in the field occurred at 27.5 to 37.5 (C).## Light.Quartz-iodine lamps have been successfully used to stimulate mating of adults. In tropical conditions, morning direct sunlight is optimal for emergence, mating, and egglaying, with.

Hermetia illucens. indirect sunlight often preferred before and after mating.## Humidity.Humidity at 70% is considered optimal for all stages of their lifecycle.Substrate was found to be unnecessary for pupation, but substrate is thought to act as a regulator for humidity which prevents desiccation. A 93% emergence rate was observed when humidity was held at 70%.## Black soldier fly larvae and redworms.Worm farmers often get larvae in their worm bins. Larvae are best at quickly converting "high-nutrient" waste into animal feed. Redworms are better at converting high-cellulose materials (paper, cardboard, leaves, plant materials except wood) into an excellent soil amendment.Redworms thrive on the.

Hermetia illucens. residue produced by the fly larvae, but larvae leachate ("tea") contains enzymes and tends to be too acidic for worms. The activity of larvae can keep temperatures around 37 (C), while redworms require cooler temperatures. Most attempts to raise large numbers of larvae with redworms in the same container, at the same time, are unsuccessful. Worms have been able to survive in/under grub bins when the bottom is the ground. Redworms can live in grub bins when a large number of larvae are not present. Worms can be added if the larval population gets low (in the cold season) and.

Hermetia illucens. worms can be raised in grub bins while awaiting eggs from wild black soldier flies.As a feeder species, BSFL are not known to be intermediate hosts of parasitic worms that infect poultry, while redworms are host to many.## Names and trademarks.BSFL were developed as a feeder insect for exotic pets by D. Craig Sheppard, who named the larvae Phoenix Worms and began marketing them as pet food. In 2006, "Phoenix Worms" became the first feeder insect to be granted a U.S. registered trademark. Other companies also market BSFL under such brand names as NutriGrubs, Soldier Grubs, Reptiworms, Calciworms, BIOgrubs, and.

Hermetia illucens. Obie's Worms (Canada). In Australia, BSFL are marketed as live feeder insects under the brand name Beardie Grubs. In Africa they are marketed as live feeder, meal and oil by ProtiCycle for animal feed, pet food for dogs and cats as well as food for fish such as tilapia and catfish.## Possible natural enemies.In West Africa, "Dirhinus giffardii" has been found to be a parasitoid of "H. illucens" pupae and decrease egg production. It has been found to reduce stocks by up to 72%. The parasite is carried by the wasps and precautions should be taken to protect the larvae.

Hermetia illucens. from exposure to these wasps. Black fly Bioconversion of Food Waste : Black Soldier fly 'Grubby' Research Promises Environmental, Economic Benefits Black soldier fly on the UF / IFAS "Featured Creatures" website.


Question: What is the length of the wingspan in centimetre of this bird?

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Common kingfisher. shape. The adult male of the western European subspecies, "A. a. ispida" has green-blue upperparts with pale azure-blue back and rump, a rufous patch by the bill base, and a rufous ear-patch. It has a green-blue neck stripe, white neck blaze and throat, rufous underparts, and a black bill with some red at the base. The legs and feet are bright red. It is about 16 (cm) long with a wingspan of 25 (cm), and weighs 34 - 46 (g). The female is identical in appearance to the male except that her lower mandible is orange-red with a black tip.

Common kingfisher. two eggs in most clutches fail to hatch because the parent cannot cover them. Both sexes incubate by day, but only the female incubates at night. An incubating bird sits trance-like, facing the tunnel; it invariably casts a pellet, breaking it up with the bill. The eggs hatch in 19–20 days, and the altricial young are in the nest for a further 24–25 days, often more. Once large enough, young birds will come to the burrow entrance to be fed. Two broods, sometimes three, may be reared in a season.## Survival.The early days for fledged juveniles are more hazardous; during.

Common kingfisher. as it searches for prey. It bobs its head when food is detected to gauge the distance and plunges steeply down to seize its prey usually no deeper than 25 (cm) below the surface. The wings are opened underwater and the open eyes are protected by the transparent third eyelid. The bird rises beak-first from the surface and flies back to its perch. At the perch the fish is adjusted until it is held near its tail and beaten against the perch several times. Once dead, the fish is positioned lengthways and swallowed head-first. A few times each day, a.

Common kingfisher. intake was 73.5 kJ per chick (i.e., 1837 kJ per 25 days of the fledging period).A challenge for any diving bird is the change in refraction between air and water. The eyes of many birds have two foveae (the fovea is the area of the retina with the greatest density of light receptors), and a kingfisher can switch from the main central fovea to the auxiliary fovea when it enters water; a retinal streak of high receptor density which connects the two foveae allows the image to swing temporally as the bird drops onto the prey. The egg-shaped lens of.


Question: In which year was this item invented or discovered?

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Solar cell. 1839, at age 19, he built the world's first photovoltaic cell in his father's laboratory. Willoughby Smith first described the "Effect of Light on Selenium during the passage of an Electric Current" in a 20 February 1873 issue of Nature. In 1883 Charles Fritts built the first solid state photovoltaic cell by coating the semiconductor selenium with a thin layer of gold to form the junctions; the device was only around 1% efficient. Other milestones include: 1888 – Russian physicist Aleksandr Stoletov built the first cell based on the outer photoelectric effect discovered by Heinrich Hertz in 1887. 1905 –.


Question: What is the closest parent taxonomy of this bird?

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Little blue heron. The little blue heron (Egretta caerulea) is a small heron belonging to the genus "Egretta". Found throughout the New World, from the United States to South America, they live in a variety of aquatic ecosystems. They are small and darkly colored as adults, although juveniles are white. They are predators that hunt fish and other animals, typically alone. They nest in trees with other species of birds. They lay anywhere between two and five eggs, with the number varying significantly throughout their range. Their numbers are declining, for reasons not entirely understood.## Taxonomy.The little blue heron was first described as.

Little blue heron. "Ardea caerulea" by Carl Linnaeus in his 10th edition of "Systema Naturae". It is now a member of the genus "Egretta".## Distribution and habitat.## Distribution."Egretta caerulea" can be found regularly in the United States, Mexico, Central America, northern South America (including Venezuela, Colombia, and Peru), and numerous Caribbean islands (including Cuba, Jamaica, and Hispaniola). They have been recorded as a vagrant in Greenland, Portugal, and South Africa. Whether or not their range is declining is unknown. In the United States, they can be found from Missouri to Virginia to Florida. They are more common in peninsular Florida than the Florida.

Little blue heron. "Egretta caerulea" are not well researched. They could include development along coastlines, habitat disturbance, predators, pesticide exposure, and parasites. The metals cadmium and lead have been found to lead to slower growth rates and higher death rates, repectively, of young birds. Field guide on Flickr Florida Bird Sounds - Florida Museum of Natural History.


Question: What is the closest parent taxonomy of this plant?

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Nymphaea odorata. Nymphaea odorata, also known as the American white waterlily, fragrant water-lily, beaver root, fragrant white water lily, white water lily, sweet-scented white water lily, and sweet-scented water lily, is an aquatic plant belonging to the genus "Nymphaea". It can commonly be found in shallow lakes, ponds, and permanent slow moving waters throughout North America where it ranges from Central America to northern Canada. It is also reported from Brazil and Guyana.## Description.This plant is rooted from a branched rhizomes which gives rise to long petioles which terminate in smooth floating leaves. Since the leaves are subject to tearing by water.

Nymphaea odorata. and waves, they are round with a waxy upper coating that is water-repellent. The flowers also float. They are radially symmetric with prominent yellow stamens and many white petals. The flowers open each day and close again each night and are very fragrant. Once the flowers are pollinated, the developing fruit is pulled back under water for maturation.Plant systematists often use it as a typical member of Nymphaeaceae, which (other than Amborella) is the most basal of the flowering plants.It is cultivated in aquatic gardens as an ornamental plant.## Chemistry.The lignans nymphaeoside A and icariside E, and the flavonols kaempferol.

Nymphaea odorata. 3-O-alpha-l-rhamnopyranoside (afzelin), quercetin 3-O-alpha-l-rhamnopyranoside (quercitrin), myricetin 3-O-alpha-l-rhamnopyranoside (myricitrin), quercetin 3-O-(6'-O-acetyl)-beta-d-galactopyranoside, myricetin 3-O-beta-d-galactopyranoside and myricetin 3-O-(6'-O-acetyl)-beta-d-galactopyranoside can be found in "N. odorata". "Nymphaea odorata" subsp. "odorata" "Nymphaea odorata" subsp. "tuberosa"## Uses.The fragrant water-lily has both medicinal and edible parts. The seeds, flowers and rhizomes can all be eaten raw or cooked. The root can be boiled to produce a liquid which can be gargled to treat sore throats or drunk to treat diarrhea. The rhizomes were also used by Native Americans to treat coughs and colds. The stem can be placed directly on teeth to treat a toothache.The muck-submerged stems are.

Nymphaea odorata. eaten by muskrats.Jepson Manual Treatment.


Question: What is the architectural style of this place?

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Blenheim Palace. and Bavarians in the War of the Spanish Succession, culminating in the Battle of Blenheim. The land was given as a gift, and construction began in 1705, with some financial support from Queen Anne. The project soon became the subject of political infighting, with the Crown cancelling further financial support in 1712, Marlborough's three-year voluntary exile to the Continent, the fall from influence of his duchess, and lasting damage to the reputation of the architect Sir John Vanbrugh.Designed in the rare, and short-lived, English Baroque style, architectural appreciation of the palace is as divided today as it was in the.


Question: What water body does the street in the image drain to?

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Oudegracht. early canal (app. 1000) connecting the Rhine section to the river Vecht. The southern part was started in 1122, after the water level of the Rhine in Utrecht dropped because of the new dam at Wijk bij Duurstede. The ground excavated was used to raise the sides of the canal, to reduce the chance of flooding. When the city's system of locks was finished in 1275 the water level was constant, enabling the creation of permanently dry cellars and new quays at water level, hence the typical wharfs () below street level. Warehouses used to line the canal. Today many.


Question: What is the vertex figure of this object?

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Tetrahedron. of a tetrahedron the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a "triangular pyramid".Like all convex polyhedra, a tetrahedron can be folded from a single sheet of paper. It has two such nets.For any tetrahedron there exists a sphere (called the circumsphere) on which all four vertices lie, and another sphere (the insphere) tangent to the tetrahedron's faces.## Regular tetrahedron.A regular tetrahedron is a tetrahedron in which all four faces are equilateral triangles. It is one of the five regular Platonic solids, which have been known.

Tetrahedron. edge of the base. This follows from the fact that the medians of a triangle intersect at its centroid, and this point divides each of them in two segments, one of which is twice as long as the other (see ).For a regular tetrahedron with side length "a", radius "R" of its circumscribing sphere, and distances "di" from an arbitrary point in 3-space to its four vertices, we haveformula_7## Isometries of the regular tetrahedron.The vertices of a cube can be grouped into two groups of four, each forming a regular tetrahedron (see above, and also , showing one of the.

Tetrahedron. with four congruent triangles as faces; the triangles necessarily have all angles acute. The regular tetrahedron is a special case of a disphenoid. Other names for the same shape include bisphenoid, isosceles tetrahedron and equifacial tetrahedron.## Orthoschemes.A 3-orthoscheme is a tetrahedron where all four faces are right triangles. An orthoscheme is an irregular simplex that is the convex hull of a tree in which all edges are mutually perpendicular. In a 3-dimensional orthoscheme, the tree consists of three perpendicular edges connecting all four vertices in a linear path that makes two right-angled turns. The 3-orthoscheme is a tetrahedron having two.

Tetrahedron. its characteristic tetrahedron by its planes of symmetry.If the tetrahedron has edge length 2, its characteristic tetrahedron's six edges have lengths , , (the exterior right triangle face, the "characteristic triangle" of the tetrahedron), plus , , (edges that are the "characteristic radii" of the tetrahedron). The 3-edge path along orthogonal edges of the orthoscheme is , , , first from a tetrahedron vertex to an tetrahedron edge center, then turning 90° to an tetrahedron face center, then turning 90° to the tetrahedron center. The orthoscheme has four dissimilar right triangle faces. The exterior face is a 30-60-90 triangle which.

Tetrahedron. is one-sixth of a tetrahedron face. The three faces interior to the tetrahedron are: a right triangle with edges , , , a right triangle with edges , , , and a right triangle with edges , , .## Space-filling tetrahedra.A space-filling tetrahedron packs with directly congruent or enantiomorphous (mirror image) copies of itself to tile space. The cube can be dissected into six 3-orthoschemes, three left-handed and three right-handed (one of each at each cube face), and cubes can fill space, so the characteristic 3-orthoscheme of the cube is a space-filling tetrahedron in this sense. A disphenoid can be.

Tetrahedron. area of a triangle.Let be three edges that meet at a point, and the opposite edges. Let be the volume of the tetrahedron; thenformula_19whereformula_20The above formula uses six lengths of edges, and the following formula uses three lengths of edges and three angles.formula_21## Heron-type formula for the volume of a tetrahedron.If , , , , , are lengths of edges of the tetrahedron (first three form a triangle; with opposite , opposite , opposite ), thenformula_22where formula_23 formula_24## Volume divider.Any plane containing a bimedian (connector of opposite edges' midpoints) of a tetrahedron bisects the volume of the tetrahedron.## Non-Euclidean volume.For.

Tetrahedron. as calculated here. Then another volume formula is given byformula_25## Properties analogous to those of a triangle.The tetrahedron has many properties analogous to those of a triangle, including an insphere, circumsphere, medial tetrahedron, and exspheres. It has respective centers such as incenter, circumcenter, excenters, Spieker center and points such as a centroid. However, there is generally no orthocenter in the sense of intersecting altitudes.Gaspard Monge found a center that exists in every tetrahedron, now known as the Monge point: the point where the six midplanes of a tetrahedron intersect. A midplane is defined as a plane that is orthogonal to.

Tetrahedron. segment joining the midpoints of two opposite edges is called a "bimedian" of the tetrahedron. Hence there are four medians and three bimedians in a tetrahedron. These seven line segments are all concurrent at a point called the "centroid" of the tetrahedron. In addition the four medians are divided in a 3:1 ratio by the centroid (see Commandino's theorem). The centroid of a tetrahedron is the midpoint between its Monge point and circumcenter. These points define the "Euler line" of the tetrahedron that is analogous to the Euler line of a triangle.The nine-point circle of the general triangle has an.

Tetrahedron. face.The radius of the twelve-point sphere is one third of the circumradius of the reference tetrahedron.There is a relation among the angles made by the faces of a general tetrahedron given byformula_26where "α" is the angle between the faces "i" and "j".The geometric median of the vertex position coordinates of a tetrahedron and its isogonic center are associated, under circumstances analogous to those observed for a triangle. Lorenz Lindelöf found that, corresponding to any given tetrahedron is a point now known as an isogonic center, "O", at which the solid angles subtended by the faces are equal, having a common.

Tetrahedron. and counterclockwise orientations of the surface.Putting any of the four vertices in the role of "O" yields four such identities, but at most three of them are independent: If the "clockwise" sides of three of them are multiplied and the product is inferred to be equal to the product of the "counterclockwise" sides of the same three identities, and then common factors are cancelled from both sides, the result is the fourth identity.Three angles are the angles of some triangle if and only if their sum is 180° (π radians). What condition on 12 angles is necessary and sufficient for.

Tetrahedron. them to be the 12 angles of some tetrahedron? Clearly the sum of the angles of any side of the tetrahedron must be 180°. Since there are four such triangles, there are four such constraints on sums of angles, and the number of degrees of freedom is thereby reduced from 12 to 8. The four relations given by this sine law further reduce the number of degrees of freedom, from 8 down to not 4 but 5, since the fourth constraint is not independent of the first three. Thus the space of all shapes of tetrahedra is 5-dimensional.## Law of.

Tetrahedron. of the tetrahedron.With this definition, the circumcenter of a tetrahedron with vertices ,, can be formulated as matrix-vector product:formula_35In contrast to the centroid, the circumcenter may not always lay on the inside of a tetrahedron.Analogously to an obtuse triangle, the circumcenter is outside of the object for an obtuse tetrahedron.## Centroid.The tetrahedron's center of mass computes as the arithmetic mean of its four vertices, see Centroid.## Faces.The sum of the areas of any three faces is greater than the area of the fourth face.## Integer tetrahedra.There exist tetrahedra having integer-valued edge lengths, face areas and volume. These are called Heronian.

Tetrahedron. tetrahedra. One example has one edge of 896, the opposite edge of 990 and the other four edges of 1073; two faces are isosceles triangles with areas of and the other two are isosceles with areas of , while the volume is .A tetrahedron can have integer volume and consecutive integers as edges, an example being the one with edges 6, 7, 8, 9, 10, and 11 and volume 48.## Related polyhedra and compounds.A regular tetrahedron can be seen as a triangular pyramid.A regular tetrahedron can be seen as a degenerate polyhedron, a uniform "digonal antiprism", where base polygons are.


Question: What is the closest parent taxonomy of this animal?

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European green lizard. The European green lizard ("Lacerta viridis") is a large lizard distributed across European midlatitudes from Slovenia and eastern Austria to as far east as the Black Sea coasts of Ukraine and Turkey. It is often seen sunning on rocks or lawns, or sheltering amongst bushes.## Taxonomy.There is an ongoing discussion as to whether "Lacerta viridis" and "Lacerta bilineata" are separate species. Genetic data weakly supports their separation into two species but more investigation needs to be done.## Description.The lizard reaches up to 15 (cm) from the tip of the muzzle to the cloaca. The tail can be up to twice.


Question: What is the closest upper taxonomy of this animal?

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Megathura crenulata. Megathura crenulata is a northeastern Pacific Ocean species of limpet in the family Fissurellidae known commonly as the great keyhole limpet or giant keyhole limpet. "Megathura" is a monotypic genus; in other words, this is the only species in that genus. This species occurs along the rocky coast of western North America, its distribution extending from Southern California to the Baja California peninsula in Mexico. It is found in the intertidal zone and in the sea up to a depth of 33 meters.## Description.Limpets of this family have a hole at the top of the shell, the portal through which.

Megathura crenulata. waste products are released. This makes them different from the true limpets, which release waste from the mantle beneath the shell. This species is one of the largest keyhole limpets.## Biology.This species consumes a varied diet of plant, animal, protist, and algal material. It has been noted to consume filamentous cyanobacteria, diatoms, brown and red algaes such as seaweeds, seagrass, forams, hydrozoans, bryozoans, nematodes, bivalves, gastropods, crustaceans, and tunicates. The larger part of its diet is composed of brown and red algae, tunicates, hydrozoans of the genus "Eudendrium" and bryozoans of the genus "Crisia"."M. crenulata" has been used for experimental.

Megathura crenulata. studies on gamete agglutination. Its blood contains a hemocyanin that appears blue due to its copper content. This protein carries oxygen as hemoglobin does in vertebrates. Unlike hemoglobin, the hemocyanin is not bound to cells but is simply dissolved in the hemolymph, the fluid part of the blood.## Keyhole limpet hemocyanin.Keyhole limpet hemocyanin from "Megathura crenulata" is used as vaccine carrier protein. Keyhole limpet hemocyanin (KLH) is a copper containing respiratory protein, similar to hemoglobin in humans. KLH is a large protein that acts as the hapten carrier part of the vaccine component, and is so far thought to be.

Megathura crenulata. non-toxic. The major potential use of KLH is for bladder carcinoma by stimulating a specific immune response, but there are many other medical uses such as stress assessment, understanding inflammatory conditions, and treating drug addiction. Vaccines and other KLH uses are in the research or trial phases. A liter of blood from a keyhole limpet will produce 20 grams of protein, which can be worth as much as $100,000.Beninger, P. G., et al. (2001). Reproductive characteristics of the archaeogastropod "Megathura crenulata". "Journal of Shellfish Research", 20(1), 301-307.


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Brühl's Terrace. Brühl's Terrace () is a historic architectural ensemble in Dresden, Germany. Nicknamed "The Balcony of Europe", the terrace stretches high above the shore of the river Elbe. Located north of the recently rebuilt Neumarkt Square and the Frauenkirche, is one of the favourite inner-city places of both locals and tourists for walking, people watching, and having a coffee.## History and character.The present-day terrace was part of the city's fortifications, rebuilt upon the 1546/47 Schmalkaldic War at the behest of Elector Maurice of Saxony and his successors Augustus and Christian. The name Brühl's Terrace is a reference to Count Heinrich von.

Brühl's Terrace. the terrace from Castle Square and Augustus Bridge. The Brühl Palace was demolished in the course of the building of the Saxon "Ständehaus" in 1900.The ensemble was totally destroyed in February 1945 when the city centre was heavily hit by the Allied Bombing of Dresden during the end phase of World War II. Today, it has been rebuilt; the precise amount restored is difficult to say as a percentage, but in general one can say the emsemble looks very much the same today as it did in the past.Today, Brühl's Terrace is again one of the main city landmarks besides.

Brühl's Terrace. the Frauenkirche (Church of our Lady), Dresden Castle, the Hofkirche and buildings on Theatre Square such as the Zwinger and the Semperoper, which are all located in the vicinity. At the "Bärenzwinger" students' club near the monument for Johann Friedrich Böttger, one can see a fingerprint in a guard rail of the terrace garden. This dactylogram is said to be proof of the strength of Augustus the Strong, who is said to have left the mark - but is only one of many myths surrounding August, such as the legend that he fathered 365 children.## Architectural parts of the terrace.Most.

Brühl's Terrace. Schilling Johann Friedrich Böttger The "Four Times of the Day" group ("Vier Tageszeiten") by Johannes Schilling## The balconies of Europe and of Dresden.Brühl's Terrace is known as the "Balcony of Europe", a name which was first thought up and used at the beginning of the 19th century and which since then has been used in all kinds of literature.The name "Balcony of Dresden", on the other hand, is more regionally used for a tower six kilometers further to the East on a slope by the Elbe in Loschwitz, an area known for expensive living. Dresden wiki.


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Begijnhof, Amsterdam. The Begijnhof is one of the oldest hofjes in Amsterdam, Netherlands. A group of historic buildings, mostly private dwellings, centre on it. As the name suggests, it was originally a Béguinage. Today it is also the site of two churches, the Catholic "Houten Huys" and the English Reformed Church.## Earliest times.The Begijnhof is the only inner court in Amsterdam which was founded during the Middle Ages, and therefore lies within the Singel — the innermost canal of Amsterdam's circular canal system. The Begijnhof is at medieval street level, which means a meter below the rest of the old city center.It.

Begijnhof, Amsterdam. is unclear when exactly the Begijnhof (Beguines' court) was founded. In 1346, the beguines still lived in a house (a document of that time mentioned one "beghynhuys"). A courtyard was only first mentioned in 1389, probably after the religious status of the city rose due to the Amsterdam Eucharistic Miracle of 1345.Originally the Begijnhof was entirely encircled by water (the "Nieuwezijds Voorburgwal", the "Spui" and the "Begijnensloot" or "Beguines' Ditch"), with the sole entrance located at the "Begijnensteeg" ("Beguines' Alley"), which had a bridge across the Begijnensloot. The back facades were therefore water-locked. The Spui entrance only dates back to.

Begijnhof, Amsterdam. the 19th century.## Characteristics.The Begijnhof differs from the usual Amsterdam patricians' court in that this old people's home was not founded by private persons. It bore closer resemblance to a convent, although the beguines enjoyed greater freedom than nuns in a convent. While beguines took a vow of chastity, and while they considered themselves obliged to attend Holy Mass every day and pray various official prayers, they were free to leave the court at any time in order to get married.## Tall Amsterdam houses.The buildings in the court are tall, characteristically Amsterdam-style town-houses, emphasising the court's relatively private character. The.

Begijnhof, Amsterdam. Begijnhof is the only court whose houses have addresses bearing the name of the court itself. Unlike most courts, the houses here do not form rows joining one dwelling with another; instead, there are 47 regular town houses, each with its individual aspect, and most of them with facades from the 17th and 18th centuries. However, the buildings themselves are usually of earlier date, eighteen of them still possessing a Gothic wooden framework.## The Wooden House.The ancient, restored wooden house ("Het Houten Huys", 34 Begijnhof) is famous as one of the two wooden houses still existing in the center of.

Begijnhof, Amsterdam. Amsterdam (the other one being Zeedijk 1); there are annexed villages like Nieuwendam (Amsterdam North) with many wooden houses and even a wooden church. This house dates from about 1528, and is the oldest wooden house in Amsterdam.The courtyard has two bleaching greens, one on each side of the chapel.## Gates.The old Begijnesloot gate, restored in 1907, dates from 1574 and has a gable stone depicting Saint Ursula, patron saint of the Amsterdam beguines. The Spui gate from about 1725 was replaced by the present gatehouse in the 19th century. The Begijnhof has a great number of gable stones, many.

Begijnhof, Amsterdam. of which show a strong Roman Catholic character.## Religious strife.After the Alteration (Protestant takeover) of 1578, when Amsterdam came under Calvinist rule, the Begijnhof was the only Roman Catholic institution to be allowed to remain in existence. This was because the houses were the beguines' private property. The Chapel, however, was closed and lay empty for around 30 years before being ceded to the English Presbyterians, and since that time has been alluded to as the "English Church". Several of the pulpit panels were designed by Piet Mondrian.## A clandestine church.In 1671, the architect Philip Vingboons converted two dwellings opposite.

Begijnhof, Amsterdam. the Chapel entrance into a "schuilkerk", or conventicle church, for Catholics, the "Church of the Saints John and Ursula", named after the patron saints of the Begijnhof. This church was kept secret, as was demanded by the city government, and could not be recognized as a church from the outside. In 1908 this became the Miracle Church, after the original Miracle Church had been deliberately destroyed by its Protestant owners.## Buried in the gutter.The most famous beguine in the Begijnhof's history is sister Cornelia Arens, who died on 14 October 1654. (Her date of birth is unknown, but she professed.

Begijnhof, Amsterdam. the vows of chastity and the Catholic faith on 6 July 1621.) Rather than be laid to rest in the Chapel, which she considered "desecrated" by Presbyterians, she chose to be buried in the gutter of the court. Legend has it that contrary to her wish, she was in fact buried in the Chapel, but her coffin was found in the adjoining gutter the following day. This happened two more times, until she was at last laid to rest in the gutter. Another version of the legend is that her soul found no peace and roamed the court at night.

Begijnhof, Amsterdam. until she was buried in the gutter.## The last beguine."Sister Antonia", whose original name was Agatha Kaptein, was born on 13 April 1887 at Akersloot. The last beguine, she died on 23 May 1971 at the age of 84. She was buried in the Sisters' Grave in the St. Barbara's Roman Catholic Cemetery in Amsterdam on 26 May of the same year.## Renovation.Until its renovation in 1979, the court had 140 dwellings — some 110 of them consisting of a single room, and about 25 comprising two. The occupants likewise numbered 140. The renovations enlarged the houses to two or.

Begijnhof, Amsterdam. three rooms. Since that time, the number of female inhabitants has been an unvaried 105. Beguines and Beghards Website of the Begijnhof Images of Begijnhof.


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La Recoleta Cemetery. La Recoleta Cemetery () is a cemetery located in the Recoleta neighbourhood of Buenos Aires, Argentina. It contains the graves of notable people, including Eva Perón, presidents of Argentina, Nobel Prize winners, the founder of the Argentine Navy, and military commanders like Julio Argentino Roca. In 2011, the BBC hailed it as one of the world's best cemeteries, and in 2013, CNN listed it among the 10 most beautiful cemeteries in the world.## History.Franciscan Recollect monks () arrived in this area, then the outskirts of Buenos Aires, in the early eighteenth century. The cemetery is built around the Recollect Convent.

La Recoleta Cemetery. imported from Paris and Milan. The entire cemetery is laid out in sections like city blocks, with wide tree-lined main walkways branching into sidewalks filled with mausoleums. These mausoleums are still being used by rich families in Argentina that have their own vault and keep their deceased there.While many of the mausoleums are in fine shape and well-maintained, others have fallen into disrepair. Several can be found with broken glass and littered with rubbish. Among many memorials are works by notable Argentine sculptors, Lola Mora and Luis Perlotti for instance. The tomb of Liliana Crociati de Szaszak, due to its.


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Peltandra virginica. a member of the arum family, Araceae, and is known by the names tuckahoe, green arrow arum, and peltandre.It was first identified as "tockowhough" by William Strachey, Secretary of the Colony of Virginia in 1611, in his book "The Historie of Travaile Into Virginia Britannia". He describes its starchy root as a primary food source of the Powhatan Indians which they gathered from the marshes of Virginia. It was originally described as "Arum virginicum" by Carl Linnaeus in 1753 and has also been placed in the genera "Alocasia", "Caladium", "Calla", "Lecontia", and "Rensselaeria". Other synonyms include "Peltandra luteospadix" and "P.


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Steller sea lion. The Steller sea lion (Eumetopias jubatus), also known as the Steller's sea lion and northern sea lion, is a near-threatened species of sea lion in the northern Pacific. It is the sole member of the genus "Eumetopias" and the largest of the eared seals (Otariidae). Among pinnipeds, it is inferior in size only to the walrus and the two species of elephant seals. The species is named for the naturalist Georg Wilhelm Steller, who first described them in 1741. The Steller sea lion has attracted considerable attention in recent decades, owing to significant and largely unexplained declines in their numbers.

Steller sea lion. over an extensive portion of their northern range in Alaska.## Description.Adult animals are lighter in color than most sea lions, ranging from pale yellow to tawny and occasionally reddish. Steller sea lion pups are born almost black, weighing around 23 (kg), and remain dark in coloration for several months. Females and males both grow rapidly until the fifth year, after which female growth slows considerably. Adult females measure 2.3 - 2.9 (m) in length, on average being 2.5 (m), and weigh 240 - 350 (kg), with an average of 263 (kg). Males continue to grow until their secondary sexual traits.

Steller sea lion. appear in their fifth to eighth year. Males are slightly longer than the females, growing to about 2.82 – 3.25 (m) long and averaging 3 (m) in length. Males have much wider chests, necks, and general forebody structure. Males can weigh between 450 – 1120 (kg), weighing on average 544 (kg). Males are further distinguished from females by broader and higher foreheads, flatter snouts, and a thick mane of coarse hair around their large necks. It is fitting then that their Latin name translates roughly as "maned one with the broad forehead".## Range.The range of the Steller sea lion extends.

Steller sea lion. from the Kuril Islands in the Sea of Okhotsk in Russia to the Gulf of Alaska in the north, down to Año Nuevo Island off the coast of central California to the south. They formerly bred as far south as the Channel Islands, but have not been observed there since the 1980s. Based on genetic anаlyses and local migration patterns, the global Steller sea lion population has traditionally been divided into an eastern and western stock at 144°W longitude, roughly through the middle of the Gulf of Alaska. Recent evidence suggests the sea lions in Russia in the Sea of.

Steller sea lion. Okhotsk and the Kuril Islands comprise a third Asian stock, while the sea lions on the eastern seaboard of Kamchatka and the Commander Islands belong to the western stock.In the summer, Steller sea lions tend to shift their range somewhat southward. Therefore, though there are no reproductive rookeries in Japan, several consistent haul-out sites are found around Hokkaidō in the winter and spring. Vagrants have been spotted in the Yellow Sea and Bohai Gulf and along the coast of Korea and China. The oldest fossil known of the species was found near Kanazawa, Japan and dates to the late Early.

Steller sea lion. Pleistocene (0.8 Ma).## Ecology.## Habitat.Steller sea lions tend to live in the coastal waters of the subarctic because of the cooler temperate climate of the area. Like all otariids, Steller sea lions are amphibious and spend some time in water and some on land. Typically, Stellar sea lions spend their time in the water feeding but haul-out onto land to reproduce, raise their pups, molt, and rest. Steller sea lions usually congregate on isolated islands because they are the ideal terrestrial habitat. These isolated islands are preferred by Stellar sea lions because they can avoid predation from terrestrial predators, easily.

Steller sea lion. thermoregulate (by means of cooling winds), and access offshore prey more easily. Some haul-out sites, known as rookeries, are commonly used for reproduction while other haul-out sites are used for other purposes like molting. However, both biotic and abiotic factors can influence the amount of time that Steller sea lions spend on land. Haul-out sites and haul-out abundance of the Steller sea lion can be determined by prey availability, predator abundance, tide levels, weather, etc.## Foraging.Steller sea lions are skilled and opportunistic marine predators, feeding on a wide range of fish and cephalopod species. Important diet components include walleye pollock,.

Steller sea lion. Atka mackerel, halibut, herring, capelin, flatfish Pacific cod, rockfish, sculpins, salmon, sand lance, and cephalopods such as various squid and octopus. They seem to prefer schooling fish and forage primarily between intertidal zones and continental shelves. They usually aggregate in groups of up to twelve in areas of prey abundance. They are known to aggregate near fishing vessels, preying on bycatch discards. Most of the data on their foraging comes from data collected off the coast of Alaska; little is known of their foraging behavior elsewhere.The composition of the diet of Steller sea lions varies seasonally and geographically; as opportunistic.

Steller sea lion. predators, they concentrate on the locally most abundant prey species. In addition to their primary marine environment, they sometimes enter estuaries and feed on brackish-water fish such as sturgeon. Very occasionally, they have been known to prey on northern fur seals, harbor seals, and sea otter pups. Records suggest that the range of their prey species has broadened over time.## Predation.Steller sea lions are top-tier carnivores, but are susceptible to predation, primarily by killer whales. Shark species are also possible predators: sleepers and great whites may prey on juvenile sea lions.## Behavior and life history.## Reproduction.Reproductively mature male sea lions.

Steller sea lion. gather together mid-spring on traditional, well-defined reproductive rookeries, usually on beaches on isolated islands. The larger, older males establish and defend distinct territories on the rookery. A week or so later, adult females arrive, accompanied occasionally by sexually immature offspring, and form fluid aggregations throughout the rookery. Like all other otariids, Steller sea lions are polygynous. However, unlike some other species, they do not coerce individual females into harems, but control spatial territories among which females freely move. Steller sea lions have used aquatic, semiaquatic, and terrestrial territories. Males with semiaquatic territories have the most success in defending them. The.

Steller sea lion. boundaries are defined by natural features, such as rocks, faults, or ridges in rocks, and territories can remain stable for 60 days. Though Steller sea lion males are generally tolerant of pups, one male filmed on Medny Island in Russia was documented killing and eating several pups in a first-ever recorded incident of cannibalism. Though researchers are uncertain as to the motives or reasons behind said attacks, it is suggested that the bull involved may have an abnormal personality akin to being psychotic.Pregnant females give birth soon after arriving on a rookery, and copulation generally occurs one to two weeks.

Steller sea lion. after giving birth, but the fertilized egg does not become implanted in the uterus until the fall. A fertilized egg may remain in embryonic diapause for up to three months before implanting and beginning to divide. Twins are rare. After a week or so of nursing without leaving the rookery, females begin to take progressively longer and more frequent foraging trips leaving their pups behind until at some point in late summer, when both the mother and pup leave the rookery together. This maternal attendance pattern is common in otariids. As pups get older the amount of time spent by.

Steller sea lion. females foraging out at sea increases. This continues until pups obtain the ideal body weight and energy reserves to eat on their own. A study conducted by the University of California, Santa Cruz found that on average male pups consume more milk than females. This may be due to the sexual dimorphism common to otariids. Reproductive males fast throughout the reproductive season, often without entering the water once from mid-May until August, when the structure of the reproductive rookeries begins to fall apart and most animals leave for the open seas and disperse throughout their range.The age at weaning is.

Steller sea lion. highly variable; pups may remain with their mothers for as long as four years. Incidents of mothers feeding daughters that are simultaneously feeding their own newborn pups have been documented, which is an extremely rare occurrence among mammals. A study done at Año Nuevo in 1983 found that female attendance and time spent with their pup was shaped by increasing nutritional demands of the pup and the pups suckling efficiency. Females averaged 21 hours ashore and 36 hours at sea. As the pups aged, females began to spend more time at sea again. As the pups matured, specifically at the.

Steller sea lion. sixth week past birth, the mother's sea time declined by 30 percent. There was no relationship between the pups' activity or physical excursion and their suckling time, age, or sex. Their suckling time, and age, and sex are unrelated to their use of energy. Labeled water studies showed that the pups' milk intake had a direct relationship to their size. Pups that consumed more milk were heavier than those that didn't. These findings show that the amount of time females spend onshore with their pups is based on their pup's suckling efficiency and nutritional demands.In the past, the low pup.

Steller sea lion. production has been tied to an increase in nutritional stress found in females. This was believed to have contributed to the decline in Steller sea lions common to Alaska.## Locomotion.The largest of the eared seals, Steller sea lions are quick swimmers, about as fast as the smaller California sea lions. Glide velocity of individual Steller sea lions has been measured as 2.9–3.4 meters or 1.2–1.5 body lengths per second, which is close to the optimal swim velocity of 1.4 body lengths per second based on the minimum cost of transport for California sea lions.A 2007 study of Steller sea lions.

Steller sea lion. found that a majority of thrust was produced during the drive phase of the fore flipper stroke cycle. Although previous findings on eared seals suggested that thrust was generated by the initial outward movement of the foreflippers or the terminal drag-based paddling phase, the 2007 study found that little or no thrust was generated during those phases. Swimming performance in sea lions is modulated by changes in the duration and intensity of movements without changing their sequence. Using criteria based on velocity and the minimum radius of turns, Steller's maneuverability is similar to other eared seals, superior to cetaceans, and.

Steller sea lion. inferior to many fish.## Diving.To be able to dive for a long period of time, Steller sea lions exhibit apnea, bradycardia, and peripheral vasoconstriction. This allows them to maximize their oxygen stores and efficiently forage during their dives. In addition to those adaptations, their thick blubber layer and outer fur layer keep their body insulated during dives.Trained Steller sea lions from Vancouver Aquarium were placed in the open ocean at the University of British Columbia's Open Water Research Station to study their diving metabolism and behavior. Steller sea lions' dives are more energetically costly if they perform dive bouts. The.

Steller sea lion. aerobic diving limit of Steller sea lions was observed to be affected by their nutritional state and feeding.## Communication.Like most otariids, Steller sea lions are vocal in air. Mature male sea lions have a range of vocalizations as part of their territorial behaviors, including belches, growls, snorts, and hisses that serve as warnings to others. Both males and females also produce underwater noises similar to their above water sounds, described as clicks, barks, and belches. The primary function of their vocalizations is for social behavior. Sonogram readings reported that Steller Sea Lions make discrete, low frequency pulses underwater that resemble.

Steller sea lion. the male "belching" territorial noise made in air. These underwater vocalizations have an average of 20–30 pulses per second.Vocalizations are critical to mother-pup pairs, as the mothers must find their pups in a crowded breeding area when they return from foraging. The mother and pup both use distinctive calls, like names, to help differentiate themselves among the crowd of other sea lions. Their aerial vocalizations have been described as similar to the bleats of sheep, and bellows.Because Steller sea lions are sexually dimorphic in size, their hearing differs in sensitivity, possibly due to differences in size of the hearing structures.

Steller sea lion. Females have a higher sensitivity than males, perhaps to hear the higher frequency calls of their pups. The Steller sea lion's hearing range also suggests that they are capable of hearing the underwater calls of one of their main predators, the killer whale.## Interactions with humans.Steller sea lion were hunted for meat and other commodities by prehistoric communities everywhere their range intersected with human communities. Aside from food and clothing, their skin was used to cover baidarkas and kayaks. A subsistence harvest on the order of 300 animals or less continues to this day in some native communities in Alaska.Historically,.

Steller sea lion. the sea lion has had only very slight commercial value. For example, in the 19th century their whiskers sold for a penny apiece for use as tobacco-pipe cleaners.Steller sea lions are sometimes killed intentionally by fishermen, as they are seen as competitors and a threat to fish stocks. Killing sea lions is strictly prohibited in the US and Russia, but in Japan a fixed number are still removed annually, ostensibly to protect their fisheries. In Canada, commercial hunting is prohibited, but limited hunting permits are occasionally granted if local culling is required—for example, nuisance animals destroying fish farms.In recent years,.

Steller sea lion. Steller sea lions have been known to enter the Columbia River estuary and feed on white sturgeon, several salmon species, and rainbow trout, some of which are also listed under the U.S. Endangered Species Act. They are found in the Columbia River nearly year round, with the exception of early summer, going as far upstream as Bonneville Dam. Though not as abundant as the California sea lion, they are still a concern for those agencies charged with managing the fish populations. Since the Steller sea lions are themselves protected under the Marine Mammal Protection Act, managers are compelled to use.

Steller sea lion. nonlethal deterrence methods, such as rubber bullets and noisemakers. Deterrence by the public is strictly forbidden.## Recent decline and subsequent recovery.While the populations of the eastern and Asian stocks appear stable, the population of the western stock, particularly along the Aleutian Islands, was estimated to have fallen by 70–80% since the 1970s. As a consequence, in 1997 the western stock of Steller sea lions was listed as endangered and the eastern stock was listed as threatened under the United States Endangered Species Act. They have since been the object of intense study and the focus of much political and scientific.

Steller sea lion. debate in Alaska.One suspected cause of their precipitous decline was the overfishing of Alaska pollock, herring, and other fish stocks in the Gulf of Alaska. This stems largely from the "junk-food hypothesis" representing a shift in their diet from fatty herring and capelin to leaner fare such as pollock and flounder, thereby limiting their ability to consume and store fat. Other hypotheses include increased predation by orcas and sharks, indirect effects of prey species composition shifts due to changes in climate, effects of disease or contaminants, shooting by fishermen, and others. The decline is certainly due to a complex of.

Steller sea lion. interrelated factors which have yet to be defined by the research effort.Another possible reason for decline in this species has been tied to the Nutritional Stress Hypothesis. The lack of prey corresponds to the decrease in population. In females specifically, obtaining an insufficient amount of nutrients has resulted in the failure to complete their pregnancies to full term.In October 2013, the eastern Steller sea lion was taken off the U.S. Endangered Species List after a major population comeback over the past several years.Eared seal Marine Mammal Center – Steller Sea Lion US National Marine Fisheries Service Steller Sea Lion web.

Steller sea lion. page ARKive – images and movies of the Steller sea lion "(Eumetopias jubatus)" Alaska Department of Fish and Game page on Steller sea lions Overview of Steller sea lion research at NOAA, National Marine Fisheries Service, National Marine Mammal Lab "Nature" documentary about the decline of Steller's sea lions News media report on Steller sea lions and sturgeon interactions SeaLionPredation.com – news and information on seal and sea lion predation of salmon and steelhead in the Pacific Northwest NOAA fact sheet on pinnipeds in the Columbia River Georg Steller's original description in "De Bestiis Marinis, or, The Beasts of the.

Steller sea lion. Sea" (1751) Watch more Steller sea lion (Eumetopias jubatus) video clips from the BBC archive on Wildlife Finder Fifteen years of research into the Alaska populations of Steller Sea Lions at the Alaska SeaLife Center WATCH: Sea lions ward off attacking orcas.


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Histria (ancient city). Histria or Istros (, Thracian river god, Danube), was a Greek colony or "polis" (πόλις, city) near the mouths of the Danube (known as Ister in Ancient Greek), on the western coast of the Black Sea. It was the first urban settlement on today's Romanian territory when founded by Milesian settlers in the 7th century BC. It was under Roman rule from the 1st to 3rd centuries AD. Invasions during the 7th century AD rendered it indefensible, and the city was abandoned. In antiquity, it also bore the names Istropolis, Istriopolis, and Histriopolis (Ἰστρόπολις, Ἰστρία πόλις).Histriopolis was a fort in.

Histria (ancient city). the Roman province of Moesia. As Tabula Peutingeriana shows it is situated between Tomis and Ad Stoma; 11 miles from Tomis and 9 miles from Ad Stoma. ## History.Established by Milesian settlers in order to facilitate trade with the native Getae, it is considered the oldest urban settlement on Romanian territory. Scymnus of Chios (ca 110 BC), dated its founding to 630 BC, while Eusebius of Caesarea set it during the time of the 33rd Olympic Games (657 – 656 BC). The earliest documented currency on today's Romanian territory was an 8-gram silver drachma, issued by the city around 480.

Histria (ancient city). BC. Archaeological evidence seems to confirm that all trade with the interior followed the foundation of Histria. Traders reached the interior via Histria and the Danube valley, demonstrated by finds of Attic black-figure pottery, coins, ornamental objects, an Ionian lebes and many fragments of amphoras. Amphoras have been found in great quantity at Histria, some imported but some local. Local pottery was produced following establishment of the colony and certainly before the mid-6th century. During the archaic and classical periods, when Histria flourished, it was situated near fertile arable land. It served as a port of trade soon after its.

Histria (ancient city). establishment, with fishing and agriculture as additional sources of income. By 100 AD, however, fishing had become the main source of Istrian revenue.Around 30 AD, Histria came under Roman domination. During the Roman period from the 1st to 3rd centuries AD, temples were built for the Roman gods, besides a public bath and houses for the wealthy. Altogether, it was in continuous existence for some 14 centuries, starting with the Greek period up to the Roman-Byzantine period. The Halmyris bay where was the city founded was closed by sand deposits and access to the Black Sea gradually was cut. Trade.

Histria (ancient city). continued until the 6th century AD. The invasion of the Avars and the Slavs in the 7th century AD almost entirely destroyed the fortress, and the Istrians dispersed; the name and the city disappeared.## Geographic setting.Ancient Histria was situated on a peninsula, about 5 (km) east of the modern Romanian commune of Istria, on the Dobruja coast. The ancient seashore has since been transformed into the western shore of Sinoe Lake, as the Danube's silt deposits formed a shoal which closed off the ancient coastline. The current Sinoe Lake was at the time the open northern bay, while another bay.

Histria (ancient city). on the southern shore served as the port. The acropolis with sanctuaries was established on the highest point of the coastal plain. The settlement itself, erected in the 6th century, was 1/2 mile (800 meters) to the west of the acropolis. The settlement had stone paved streets and was protected by strong wall. Water was collected along 12.5 mile (20 km) long aqueducts.## Archaeology.The ruins of the settlement were first identified in 1868 by French archaeologist Ernest Desjardins. Archaeological excavations were started by Vasile Pârvan in 1914, and continued after his death in 1927 by teams of archaeologists led successively.

Histria (ancient city). by Scarlat and Marcelle Lambrino (1928–1943), Emil Condurachi (1949–1971), Dionisie Pippidi (1971-1989), Petre Alexandrescu (1990-1999), Alexandru Suceveanu (1990-2009), Alexandru Avram and Mircea Angelescu (starting 2010). The Histria Museum, founded in 1982, exhibits some of these finds. The excavation project and site also features prominently in the film "The Ister".Archeological research in Histria managed to identify and classify several layers on site. The layer stratification can be divided primarily between the Archaic and Classical periods:## Archaic Greek layers.The ancient Greek city covered around 60 hectares. There are very few written references to the archaic city and archeological research provides the main.

Histria (ancient city). historical resource. The main deity was Apollo Ietros ("The Healer"). Zeus (Gr. Polieus) was the "protector deity" of the city and Aphrodita was also confirmed by archeological research. Historians believe all six Milesian tribes (Greek: "phylai") were represented in the colony, yet only four tribes are attested to: the Aigikoreis, Argadeis, Boreis and Geleontes. The only clue concerning the government of the city was given by Aristotle in "Politica". Thanks to his comment, it is clear that the first government of Histria was an oligarchy. From an economic point of view, the town was developed around port-related activities.## Archaic Greek.

Histria (ancient city). layer I (650–600 BC).After the stage of emporium, a polis was founded soon after 650 BC. Temples and dwellings of this time were discovered. By the beginning of the VIth century Histria was already a prosperous colony.## Archaic Greek layer II (600–550 BC).During this period a new city wall was built around the city, probably in connection with the frequent raids of the scythians.The Acropolis started to be defended by a wall, discovered by Sc. Lambrino. Another city wall was running around the western Plateau, defending also the port.## Archaic Greek layer III (550–500 BC).The Archaic age of Histria is.

Histria (ancient city). finishing with a massive destruction on the occasion, most probably, of an expedition of the Persian general Mardonios (Mardonios (old Persian Marduniya, Persian Mrdunya, Greek Μαρδόνιος (Mardónios), Latin Mardonius; † 479 B. C. during the battle of Plateaea).Another theory says the destruction of the city has taken place, probably in 512 BC, when Darius I undertook a war against the Scythians. It is still unclear if this fact is connected to the Persian expedition led by Darius, to the Scythians followers of the Persian army during the retreat or to the expedition of Mardonios.## Classical Greek layers.During the classical period,.

Histria (ancient city). there was continuity in the cults of Apollo Ietros; Zeus (Gr. Polieus) and Aphrodita. During the classical period many written sources describe the political organisation of the area.The Odrysian kingdom was involved in fighting with the Scythians ruled by Ariapeithes and Histria was situated between the two kingdoms. Due to that, most probably, Histria town was forced to join the Delian League. In the 5th century BC, these colonies were under the influence of the Delian League, passing in this period from oligarchy to democracy. From an economic point of view it was during this era that the first Histrian.

Histria (ancient city). coins were minted: a didrachma, oboli and bronze coins.## Classical Greek layer I (500–425 BC).The town was flourishing in the period of Athens's Peloponnesian Wars when the Athenian fleet came to the Greek colonies placed on the shores of the "Pontos Euxeinos" (Black Sea) to collect the contributions for the Delian Treasure (Thucydides). A new wall was built to protect a wider area then before, around the Histrian Acropolis, probably in connection with the democratic "revolution" mentioned by Aristotle in "The Politics" (cap. 5), referring to the change of the Histrian constitution, evolving from oligarchy to democracy. The city wall,.

Histria (ancient city). protecting the settlement and the port, was repaired.## Classical Greek layer II (425–350 BC).The town was dismantled for a second time in the 4th century BC, during the war between the Scythian king Ateas and Macedonian king Philip II. who destroyed the city walls protecting the Acropolis and the one protecting the whole town.## Hellenistic layers.During the Hellenistic period, there was continuity in the cult of Apollo Ietros, Zeus (Gr. "Polieus") and Aphrodita. A new temple for a "grand deity" was built. There is also evidence of the cult of Athena, Poseidon, Helikonios, Taurios, Demetra, Hermes Agoraios, Heracles, Asclepios, Dioscurii.

Histria (ancient city). and others. A new wall also appears, protecting a 10 ha area. During the Hellenistic period Histria had become an important supplier of grain for Greece. However, the economic power of Histria was represented by trade. In the Hellenistic period, the gymnasium and the theater were erected.## Hellenistic layer I (350–300 BC).The town was once again destroyed around 339 BC. During the period 313–309 BC, a rebellion of Pontic towns took place. Miletus however awarded Histrians equal political rights, or so-called isopoliteia.## Hellenistic layer II (300–175 BC).Around 260 BC, Byzantium was involved in a dispute with Histria and Callatis (modern.

Histria (ancient city). Mangalia) over Tomis "emporion" (Εμπόριον, market) (i.e. modern Constanţa). Another destruction of the city, somewhere around 175 BC, was most probably wreaked by Bastarni passing through after being called upon by Macedonian king Philip V or Perseus to reinforce the army.## Hellenistic layer III (175–100 BC).Mithridates installed a military garrison in Histria, which probably caused the third destruction of the city in the Hellenistic period. During the rule of Mithridates staters are minted in Histria.## Hellenistic layer IV (100–20 BC).Burebista arrived in Dobruja. (Gaius Antonius Hybrida)...while governor of Macedonia, had inflicted many injuries upon the subject territory as well as.

Histria (ancient city). upon that which was in alliance with Rome, and had suffered many disasters in return. 2 For after ravaging the possessions of the Dardanians and their neighbours, he did not dare to await their attack, but pretending to retire with his cavalry for some other purpose, took to flight; in this way the enemy surrounded his infantry and forcibly drove them out of the country, even taking away their plunder from them. 3 When he tried the same tactics on the allies in Moesia, he was defeated near the city of the Istrians by the Bastarnian Scythians who came to.

Histria (ancient city). their aid; and thereupon he ran away...The Hellenistic period was ended by Marcus Antonius who was in charge of the eastern Roman government, and was defeated by Octavian at Actium.## Roman layers.## Early Roman layer IA (30–100 AD).Continuous with the Hellenistic period. A new thermae (Thermae I) was built. This period is considered by historians, thanks to two inscribed artifacts, as the second founding of the city.## Early Roman layer IB (100–170 AD).In around 170 AD, a part of the town was destroyed.## Early Roman layer IC (170–250 AD).The town suffered serious destruction from which it never recovered. The main.

Histria (ancient city). theory is that it was destroyed by an invasion of Goths and Carpi. Another theory presumes that the town was destroyed in an earthquake.Late Roman layer IIBLate Roman layer IIIALate Roman layer IIIBLate Roman layer IVALate Roman layer IVBLate Roman layer VALate Roman layer VB## Bulgarian period (9th and 10th centuries).Bulgars arrived in Scythia Minor in the late 7th century.CapidavaCivitas TropaensiumHalmyrisList of ancient towns in Scythia MinorPeuce IslandTropaeum TraianiThe Histria Archaeological SiteHistria, dr. Al. Suceveanu, dr. M. Angelescu edsHistria's New Look - A 3D Model, dr. M. AngelescuHistory Microregion Sinoe - by Doctor Archaeologist Catalin Dobrinescu Tur video Histria -.

Histria (ancient city). INP 360 Hellenistic Greek inscriptions of Istros in English translation Greek cities on the western coast of the Black Sea, dissertation by S.Andrews, Chapter 4 (PDF) Wheel money /wheel coin/, 500-400 BC: ancient city Istros.


Question: Who found this aircraft?

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Beechcraft. Kansas, in 1932 by Walter Beech as president, his wife Olive Ann Beech as secretary, Ted A. Wells as vice president of engineering, K. K. Shaul as treasurer, and investor C. G. Yankey as vice president. The company began operations in an idle Cessna factory. With designer Ted Wells, they developed the first aircraft under the Beechcraft name, the classic Beechcraft Model 17 Staggerwing, which first flew in November 1932. Over 750 Staggerwings were built, with 352 manufactured for the United States Army Air Forces and 67 for the United States Navy during World War II.Beechcraft was not Beech's first.

Beechcraft. after the sudden death of her husband from a heart attack on November 29 of that year. She continued as CEO until Beech was purchased by Raytheon Company on February 8, 1980. Ted Wells had been replaced as chief engineer by Herbert Rawdon, who remained at the post until his retirement in the early 1960s.Throughout much of the mid-to-late 20th century, Beechcraft was considered one of the "Big Three" in the field of general aviation manufacturing, along with Cessna and Piper Aircraft.In 1994, Raytheon merged Beechcraft with the Hawker product line it had acquired in 1993 from British Aerospace, forming.


Question: Who found this building?

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Hofje van Mevrouw van Aerden. The Hofje van Mevrouw van Aerden is a museum and former hofje in Leerdam, Netherlands, on the Kerkstraat (numbers 57 and 89).It was built during the years 1770-1772 on the former location of the "Kasteel van Leerdam", a castle that was destroyed by the Spanish in 1574. The hofje was founded by Maria Ponderus, the daughter of a surgeon who at 20 married the 50-year-old widower Pieter van Aerden, notary in The Hague. She lived to 92, surviving her husband and three children, who also had no issue. She decided to leave her fortune to a hofje for women of.

Hofje van Mevrouw van Aerden. the Protestant faith. Though she had intended her hofje for the poor of The Hague, by the time she died the most of her poor relations were living in Leerdam. Through connections with the House of Orange, the site of the old castle of Leerdam was chosen to build the hofje.## Art collection.A large collection of paintings was also left to the hofje, including paintings by leading 17th-century Dutch painters such as genre pieces by Frans Hals (1x), Cornelis de Man (1x), Dirck van der Lisse (2x), and Theodoor van Thulden (1x); portraits by Adriaen Hanneman (1x), Hendrick Cornelisz van.

Hofje van Mevrouw van Aerden. Vliet (2x), Gerard ter Borch (2x), and Mattheus Verheyden (2x); still lifes by Pieter Claesz (1x), Cornelis de Heem (2x), Ottomar Elliger (1x), and Laurens Craen (1x); and landscapes by Hendrick Jacobsz Dubbels (2x), Philips Koninck (1x), and Jacob Salomonsz van Ruysdael (1x). These hang in the regent's rooms. On 28 May 2011 the paintings "Two laughing boys with mug of beer" by Hals and "Wooded landscape" by Jacob van Ruysdael were stolen. On 2 November 2011 they were recovered. Maria Ponderus on historici.nl.


Question: What is the facet of this object?

Instruction: Determine the Wikipedia snippet that matches the question of this image.

Hexagon. In geometry, a hexagon (from Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon or 6-gon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.## Regular hexagon.A "regular hexagon" has Schläfli symbol {6} and can also be constructed as a truncated equilateral triangle, t{3}, which alternates two types of edges.A regular hexagon is defined as a hexagon that is both equilateral and equiangular. It is bicentric, meaning that it is both cyclic (has a circumscribed circle) and tangential (has an inscribed circle).The common length of the sides equals the radius.

Hexagon. of the circumscribed circle or circumcircle, which equals formula_1 times the apothem (radius of the inscribed circle). All internal angles are 120 degrees. A regular hexagon has six rotational symmetries ("rotational symmetry of order six") and six reflection symmetries ("six lines of symmetry"), making up the dihedral group D6. The longest diagonals of a regular hexagon, connecting diametrically opposite vertices, are twice the length of one side. From this it can be seen that a triangle with a vertex at the center of the regular hexagon and sharing one side with the hexagon is equilateral, and that the regular hexagon.

Hexagon. can be partitioned into six equilateral triangles.Like squares and equilateral triangles, regular hexagons fit together without any gaps to "tile the plane" (three hexagons meeting at every vertex), and so are useful for constructing tessellations. The cells of a beehive honeycomb are hexagonal for this reason and because the shape makes efficient use of space and building materials. The Voronoi diagram of a regular triangular lattice is the honeycomb tessellation of hexagons. It is not usually considered a triambus, although it is equilateral.## Parameters.The maximal diameter (which corresponds to the long diagonal of the hexagon), "D", is twice the maximal.

Hexagon. radius or circumradius, "R", which equals the side length, "t". The minimal diameter or the diameter of the inscribed circle (separation of parallel sides, flat-to-flat distance, short diagonal or height when resting on a flat base), "d", is twice the minimal radius or inradius, "r". The maxima and minima are related by the same factor:formula_2 and, similarly, formula_3The area of a regular hexagonformula_4For any regular polygon, the area can also be expressed in terms of the apothem "a" and the perimeter "p". For the regular hexagon these are given by "a" = "r", and "p"formula_5, soformula_6The regular hexagon fills the.

Hexagon. fraction formula_7 of its circumscribed circle.If a regular hexagon has successive vertices A, B, C, D, E, F and if P is any point on the circumcircle between B and C, then .It follows from the ratio of circumradius to inradius that the height-to-width ratio of a regular hexagon is 1:1.1547005; that is, a hexagon with a long diagonal of 1.0000000 will have a distance of 0.8660254 between parallel sides.## Point in plane.For an arbitrary point in the plane of a regular hexagon with circumradius formula_8, whose distances to the centroid of the regular hexagon and its six vertices are.

Hexagon. formula_9 and formula_10 respectively, we haveformula_11formula_12formula_13If formula_10 are the distances from the vertices of a regular hexagon to any point on its circumcircle, then formula_15## Symmetry.The "regular hexagon" has D6 symmetry. There are 16 subgroups. There are 8 up to isomorphism: itself (D6), 2 dihedral: (D3, D2), 4 cyclic: (Z6, Z3, Z2, Z1) and the trivial (e)These symmetries express nine distinct symmetries of a regular hexagon. John Conway labels these by a letter and group order. r12 is full symmetry, and a1 is no symmetry. p6, an isogonal hexagon constructed by three mirrors can alternate long and short edges, and.

Hexagon. d6, an isotoxal hexagon constructed with equal edge lengths, but vertices alternating two different internal angles. These two forms are duals of each other and have half the symmetry order of the regular hexagon. The i4 forms are regular hexagons flattened or stretched along one symmetry direction. It can be seen as an elongated rhombus, while d2 and p2 can be seen as horizontally and vertically elongated kites. g2 hexagons, with opposite sides parallel are also called hexagonal parallelogons.Each subgroup symmetry allows one or more degrees of freedom for irregular forms. Only the g6 subgroup has no degrees of freedom.

Hexagon. but can seen as directed edges.Hexagons of symmetry g2, i4, and r12, as parallelogons can tessellate the Euclidean plane by translation. Other hexagon shapes can tile the plane with different orientations.## A2 and G2 groups.The 6 roots of the simple Lie group , represented by a Dynkin diagram , are in a regular hexagonal pattern. The two simple roots have a 120° angle between them.The 12 roots of the Exceptional Lie group G2, represented by a Dynkin diagram are also in a hexagonal pattern. The two simple roots of two lengths have a 150° angle between them.## Dissection.Coxeter states that.

Hexagon. every zonogon (a 2"m"-gon whose opposite sides are parallel and of equal length) can be dissected into parallelograms. In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi. This decomposition of a regular hexagon is based on a Petrie polygon projection of a cube, with 3 of 6 square faces. Other parallelogons and projective directions of the cube are dissected within rectangular cuboids.## Related polygons and tilings.A regular hexagon has Schläfli symbol {6}. A regular hexagon is a part of the regular hexagonal tiling, {6,3}, with three hexagonal faces around.

Hexagon. each vertex.A regular hexagon can also be created as a truncated equilateral triangle, with Schläfli symbol t{3}. Seen with two types (colors) of edges, this form only has D3 symmetry.A truncated hexagon, t{6}, is a dodecagon, {12}, alternating two types (colors) of edges. An alternated hexagon, h{6}, is an equilateral triangle, {3}. A regular hexagon can be stellated with equilateral triangles on its edges, creating a hexagram. A regular hexagon can be dissected into six equilateral triangles by adding a center point. This pattern repeats within the regular triangular tiling.A regular hexagon can be extended into a regular dodecagon by.

Hexagon. adding alternating squares and equilateral triangles around it. This pattern repeats within the rhombitrihexagonal tiling.## Self-crossing hexagons.There are six self-crossing hexagons with the vertex arrangement of the regular hexagon:## Hexagonal structures.From bees' honeycombs to the Giant's Causeway, hexagonal patterns are prevalent in nature due to their efficiency. In a hexagonal grid each line is as short as it can possibly be if a large area is to be filled with the fewest hexagons. This means that honeycombs require less wax to construct and gain much strength under compression.Irregular hexagons with parallel opposite edges are called parallelogons and can also tile.

Hexagon. the plane by translation. In three dimensions, hexagonal prisms with parallel opposite faces are called parallelohedrons and these can tessellate 3-space by translation.## Tesselations by hexagons.In addition to the regular hexagon, which determines a unique tessellation of the plane, any irregular hexagon which satisfies the Conway criterion will tile the plane.## Hexagon inscribed in a conic section.Pascal's theorem (also known as the "Hexagrammum Mysticum Theorem") states that if an arbitrary hexagon is inscribed in any conic section, and pairs of opposite sides are extended until they meet, the three intersection points will lie on a straight line, the "Pascal line.

Hexagon. of that configuration.## Cyclic hexagon.The Lemoine hexagon is a cyclic hexagon (one inscribed in a circle) with vertices given by the six intersections of the edges of a triangle and the three lines that are parallel to the edges that pass through its symmedian point.If the successive sides of a cyclic hexagon are "a", "b", "c", "d", "e", "f", then the three main diagonals intersect in a single point if and only if .If, for each side of a cyclic hexagon, the adjacent sides are extended to their intersection, forming a triangle exterior to the given side, then the segments.

Hexagon. connecting the circumcenters of opposite triangles are concurrent.If a hexagon has vertices on the circumcircle of an acute triangle at the six points (including three triangle vertices) where the extended altitudes of the triangle meet the circumcircle, then the area of the hexagon is twice the area of the triangle.## Hexagon tangential to a conic section.Let ABCDEF be a hexagon formed by six tangent lines of a conic section. Then Brianchon's theorem states that the three main diagonals AD, BE, and CF intersect at a single point.In a hexagon that is tangential to a circle and that has consecutive sides.

Hexagon. "a", "b", "c", "d", "e", and "f",formula_16## Equilateral triangles on the sides of an arbitrary hexagon.If an equilateral triangle is constructed externally on each side of any hexagon, then the midpoints of the segments connecting the centroids of opposite triangles form another equilateral triangle.## Skew hexagon.A skew hexagon is a skew polygon with six vertices and edges but not existing on the same plane. The interior of such an hexagon is not generally defined. A "skew zig-zag hexagon" has vertices alternating between two parallel planes.A regular skew hexagon is vertex-transitive with equal edge lengths. In three dimensions it will be.

Hexagon. a zig-zag skew hexagon and can be seen in the vertices and side edges of a triangular antiprism with the same D3d, [2+,6] symmetry, order 12.The cube and octahedron (same as triangular antiprism) have regular skew hexagons as petrie polygons.## Petrie polygons.The regular skew hexagon is the Petrie polygon for these higher dimensional regular, uniform and dual polyhedra and polytopes, shown in these skew orthogonal projections:## Convex equilateral hexagon.A "principal diagonal" of a hexagon is a diagonal which divides the hexagon into quadrilaterals. In any convex equilateral hexagon (one with all sides equal) with common side "a", there exists a.

Hexagon. principal diagonal "d"1 such thatformula_17and a principal diagonal "d"2 such thatformula_18## Polyhedra with hexagons.There is no Platonic solid made of only regular hexagons, because the hexagons tessellate, not allowing the result to "fold up". The Archimedean solids with some hexagonal faces are the truncated tetrahedron, truncated octahedron, truncated icosahedron (of soccer ball and fullerene fame), truncated cuboctahedron and the truncated icosidodecahedron. These hexagons can be considered truncated triangles, with Coxeter diagrams of the form and .There are other symmetry polyhedra with stretched or flattened hexagons, like these Goldberg polyhedron G(2,0):There are also 9 Johnson solids with regular hexagons: 24-cell: a.

Hexagon. four-dimensional figure which, like the hexagon, has orthoplex facets, is self-dual and tessellates Euclidean space Hexagonal crystal system Hexagonal number Hexagonal tiling: a regular tiling of hexagons in a plane Hexagram: six-sided star within a regular hexagon Unicursal hexagram: single path, six-sided star, within a hexagon Honeycomb conjecture Havannah: abstract board game played on a six-sided hexagonal gridDefinition and properties of a hexagon with interactive animation and construction with compass and straightedge.An Introduction to Hexagonal Geometry on Hexnet a website devoted to hexagon mathematics.Hexagons are the Bestagons an animated youtube video about hexagons.


Question: What is the closest upper taxonomy of this insect?

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Caenurgina crassiuscula. Caenurgina crassiuscula, the clover looper or range grass moth, is a moth of the family Erebidae. The species was first described by Adrian Hardy Haworth in 1809. It is found from coast to coast in the United States and adjacent parts of Canada, in the west to the Northwest Territories, Yukon, and Alaska.The wingspan is 30–40 mm. Adults are on wing from March to November depending on the location.The larvae feed on various species of clover, grass, and lupine. List establishing "Caenurgina distincta" as a synonym.


Question: In which year was this item invented or discovered?

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Telephone. A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user. The term is derived from ("tēle", "far") and φωνή ("phōnē", "voice"), together meaning "distant voice". A common short form of the term is phone, which came into use almost immediately after the first patent was issued.In 1876, Alexander Graham Bell.

Telephone. inventions such as radio, television, the light bulb, and the computer, several inventors pioneered experimental work on "voice transmission over a wire" and improved on each other's ideas. New controversies over the issue still arise from time to time. Charles Bourseul, Antonio Meucci, Johann Philipp Reis, Alexander Graham Bell, and Elisha Gray, amongst others, have all been credited with the invention of the telephone.Alexander Graham Bell was the first to be awarded a patent for the electric telephone by the United States Patent and Trademark Office (USPTO) in March 1876. Before Bell's patent, the telephone transmitted sound in a way.

Telephone. that was similar to the telegraph. This method used vibrations and circuits to send electrical pulses, but was missing key features. Bell found that this method produced a sound through intermittent currents, but in order for the telephone to work a fluctuating current reproduced sounds the best. The fluctuating currents became the basis for the working telephone, creating Bell's patent. That first patent by Bell was the "master patent" of the telephone, from which other patents for electric telephone devices and features flowed. The Bell patents were forensically victorious and commercially decisive.In 1876, shortly after Bell's patent application, Hungarian engineer.

Telephone. that English technicians to whom Mr. Manzetti illustrated his method for transmitting spoken words on the telegraph wire intend to apply said invention in England on several private telegraph lines". However, telephones would not be demonstrated there until 1876, with a set of telephones from Bell. 28 December 1871: Antonio Meucci files patent caveat No. 3335 in the U.S. Patent Office titled "Sound Telegraph", describing communication of voice between two people by wire. A 'patent caveat' was not an invention patent award, but only an unverified notice filed by an individual that he or she intends to file a regular.

Telephone. patent application in the future. 1874: Meucci, after having renewed the caveat for two years does not renew it again, and the caveat lapses. 6 April 1875: Bell's U.S. Patent 161,739 "Transmitters and Receivers for Electric Telegraphs" is granted. This uses multiple vibrating steel reeds in make-break circuits. 11 February 1876: Elisha Gray invents a liquid transmitter for use with the telephone but does not build one. 14 February 1876: Gray files a patent caveat for transmitting the human voice through a telegraphic circuit. 14 February 1876: Alexander Graham Bell applies for the patent "Improvements in Telegraphy", for electromagnetic telephones.

Telephone. using what is now called amplitude modulation (oscillating current and voltage) but which he referred to as "undulating current". 19 February 1876: Gray is notified by the U.S. Patent Office of an interference between his caveat and Bell's patent application. Gray decides to abandon his caveat. 7 March 1876: Bell's U.S. patent 174,465 "Improvement in Telegraphy" is granted, covering "the method of, and apparatus for, transmitting vocal or other sounds telegraphically…by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sound." 10 March 1876: The first successful telephone transmission of clear.

Telephone. speech using a liquid transmitter when Bell spoke into his device, "Mr. Watson, come here, I want to see you." and Watson heard each word distinctly. 30 January 1877: Bell's U.S. patent 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell. 27 April 1877: Edison files for a patent on a carbon (graphite) transmitter. The patent 474,230 was granted 3 May 1892, after a 15-year delay because of litigation. Edison was granted patent 222,390 for a carbon granules transmitter in 1879.## Early commercial instruments.Early telephones were technically diverse. Some used a water microphone,.

Telephone. (MMS) Party line (telephony) Phone hacking Satellite phone SIM card Spamming Telephone keypad Telephone jack and plug Telephone tapping Tip and ring Videophone Brooks, John (1976). "Telephone: The first hundred years". HarperCollins. Casson, Herbert Newton. (1910) "The history of the telephone" online. Coe, Lewis (1995). "The Telephone and Its Several Inventors: A History." Jefferson, NC: McFarland & Co. Evenson, A. Edward (2000). "The Telephone Patent Conspiracy of 1876: The Elisha Gray – Alexander Bell Controversy." Jefferson, NC: McFarland & Co. Fischer, Claude S. (1994) "America calling: A social history of the telephone to 1940" (Univ of California Press, 1994) Huurdeman,.

Telephone. Anton A. (2003). "The Worldwide History of Telecommunications" Hoboken: NJ: Wiley-IEEE Press. John, Richard R. (2010). "Network Nation: Inventing American Telecommunications." Cambridge, MA: Harvard University Press. MacDougall, Robert. "The People's Network: The Political Economy of the Telephone in the Gilded Age." Philadelphia: University of Pennsylvania Press. Mueller, Milton. (1993) "Universal service in telephone history: A reconstruction." "Telecommunications Policy" 17.5 (1993): 352–69. Todd, Kenneth P. (1998), "A Capsule History of the Bell System". American Telephone & Telegraph Company (AT&T). Early U.S. Telephone Industry Data Virtual museum of early telephones The Telephone, 1877 —"Telegraphy" (Bell's first telephone patent)—Alexander Graham Bell US 186,787—"Electric.


Question: What country does this lake belong to?

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Seehamer See. Seehamer See is a lake in the Alpine foothills, Bavaria, Germany. At an elevation of 653 m, its surface area is 1.47 km².List of lakes in Bavaria.


Question: Where is this plant originally discovered?

Instruction: Retrieve a Wikipedia paragraph that provides an answer to the given query about the image.

Rye. northern China.Production levels of rye have fallen since 1992 in most of the producing nations, . For instance, production of rye in Russia fell from 13.9 (e6t) in 1992 to 2.4 (e6t) in 2020. Corresponding figures for other countries are as follows: Polandfalling from 4.0 (Mt) in 1992 to 2.9 (Mt) in 2020; Belarusfalling from 3.1 (Mt) in 1992 to 1.1 (Mt) in 2020; Chinafalling from 1.7 (Mt) in 1992 to 0.5 (Mt) in 2020. However, production levels rose in Germany from 2.4 (Mt) in 1992 to 3.5 (Mt) in 2020.World trade of rye is low compared with other grains.