question:  What gives away the location of the lens?
context: Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] We had left the offices of Interstellar Voice three days ago, Earth time, and now as the immense disc of Jupiter flamed across the sky, entered the outer limits of the Baldric. Everything else was blanketed by the sand and the powerful wind that blew from all quarters. If my calculations are right, we've hit it at its narrowest spot." He could be excused this time, however, for this was only our third day on Jupiter's Eighth Moon, and the country was still strange to us. As for Xartal, he was a Martian and was slated to do the illustrations for Grannie's new book. "However, as you perhaps know, the only reason for colonial activities here at all is because of the presence of an ore known as Acoustix. It's no use to the people of Earth but of untold value on Mars. Then it was found that this ore, Acoustix, revitalized their sounding apparatus, and the rush was on." "But up until now this moon is the only place where it can be found. So now here we were at the outer reaches of the Baldric, four travelers on foot with only the barest necessities in the way of equipment and supplies. Xartal, the Martian illustrator, already had a notebook in his hands and was sketching a likeness of the creature. Above us, the great disc of Jupiter began to descend toward the horizon. She offered no further explanation, but a quarter of an hour later as we topped another rise a curious elliptical car with a long slanting windscreen came into view. Attached to its hood was a taut wire which slanted up into the sky to connect with the kite. Occasionally he touched a stud on an electric windlass to which the kite wire was attached. Apparently these adjustments moved planes or fins on the kite and accounted for the car's ability to move in any direction. After that we were rolling up the driveway that led to the offices of Larynx Incorporated .
output:  Workers were showing their first symptoms after being in the barracks.
options:  When Billy enters the barracks, he realizes he's being hit by Red Fever.  Workers were showing their first symptoms from working in the mines.  The location was written in the Fever Victims file.  Workers were showing their first symptoms after being in the barracks.