Why Only Humans Weep: The Science Behind Our Tears

 

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The scientific debate about the origins of our weeping goes back some time. The great ethologist Charles Darwin himself did not think much of… http://healthmedicinet.com/i/why-only-humans-weep-the-science-behind-our-tears/

http://healthnewstop.tumblr.com/post/50253997979/why-only-humans-weep-the-science-behind-our-tears

 

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