Hot water can freeze faster than cold water.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Aluminum used to be more valuable than gold!
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Sound at the right vibration can bore holes through a solid object.
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During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
A cesium atom in an atomic clock beats over nine billion times a second.
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