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Additional Resources for you to Explore

Check out these microscopic images of tears. So beautiful!

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Many animals yelp or cry out when they're in pain. But as far as scientists can tell, we humans seem to be the only species that shed tears for emotional reasons. Scientists who study evolution say crying probably conferred some benefit and did something to advance our species — because it's stayed with us. Read more here.

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Women do it 64 times a year, men just 17. Actors and politicians do it on demand. But why does crying happen in the first place? John-Paul Flintoff learns that even scientists are still guessing.

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TED-Ed
Lesson Creator
New York, NY

It is sometimes difficult to see how or why certain human physical characteristics would have evolved. One theory about emotional tears is that they signal your emotional state to others. Another says that they help to stabilize your mood by releasing stress hormones.

Feb 25 • 
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