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Why Do Humans Cry?
"One theory is that crying may have evolved as a kind of signal - a signal that was valuable because it could only be picked up by those closest to us who could actually see our tears." NPR 08/23/10
"One theory is that crying may have evolved as a kind of signal - a signal that was valuable because it could only be picked up by those closest to us who could actually see our tears." NPR 08/23/10
Posted August 24, 2010 09:42 PM
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