PhET provides fun, interactive, research-based simulations of physical phenomena for free.
To help students visually comprehend concepts, PhET simulations animate concepts that are invisible to the eye through the use of graphics and intuitive controls. Static electricity, friction, gravity and many other topics are explored.
NatGeo Young Explorer
This online magazine features a read aloud option, teacher and student activities, and even interactive whiteboard lessons! Great for teaching the common core!