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Making a Solar Still

Imagine for a moment that you are stranded in the desert, and running short on water. Or imagine that you are in a boat far out at sea, surrounded by salt water, but no fresh water to drink. Is there any way you could use some science to get something to drink? Of course there is!

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colorful crystals
I took this photo while working on the "Micro-Crystals" video, and thought this might be a challenge. What common chemical is this? Hint: The colors are from polarizing filters. The crystals are normally clear.

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goat
Goats have unusual eyes with a wide, rectangular pupil. What other animals have that kind of pupil?

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