Why Do We Cry?

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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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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.
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Produced by PBS Digital Studios
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