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Why Do We Cry Sad Tears?

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To learn more about Brilliant, check out https://brilliant.org/BeSmart/
You might cry if you don’t SUBSCRIBE! ►► http://bit.ly/iotbs_sub
↓↓↓ More info and sources below ↓↓↓

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!

Give us a hand and SUBSCRIBE! ►► http://bit.ly/iotbs_sub

References: http://bit.ly/2NMz5Wo


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It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D.
Director: Joe Nicolosi
Writer: Kimberly McCoy, Ph.D.
Creative Director: David Schulte
Editor/animator: Derek Borsheim
Producers: Stephanie Noone and Amanda Fox

Produced by PBS Digital Studios
Music via APM
Stock images from Shutterstock http://www.shutterstock.com

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