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Science » Other Science

Everyday Mysteries

provides illustrations and explanations to help us understand: Why are summers hot and winters cold? What does "the universe is expanding" mean? How does GPS work? Why do boomerangs come back? How does static electricity work? What causes the sound of thunder? How does sunscreen work? Why does hair turn gray? Why does chopping an onion make you cry? Why and how do cats purr? (Library of Congress)

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Interesting Fact:

One can find both counterclockwise and clockwise flowing drains in both hemispheres. Some people would like you to believe that the Coriolis force affects the flow of water down the drain in sinks, bathtubs, or toilet bowls. The Coriolis force is simply too weak to affect such small bodies of water.
Skier with sunscreen on his or her nose

How does sunscreen work?

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