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It's Okay to Be Smart
Why Do We Cry?
Season 6
Episode 20
Why do we cry? It’s weird. Humans leak water out of their faces when they get sad. Are we the only animals that do this? What does it mean? What is it for? Here’s the science of human tears!
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12:44
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27:56
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10:00
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10:41
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19:07
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22:18
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9:42
We explore why animals like whales, elephants, and other large animals not get cancer.