Science Why Do Humans Have Chins? A Scientist Explains The 'Enduring Puzzle' 5:37pm January 29, 2016 Science Humans Share URL copied to clipboard! Copyright 2016 NPR. To see more, visit NPR. 300x250 Ad More All Things Considered National What the jury in the Sean Combs trial will be deliberating by Anastasia Tsioulcas National The latest in the deadly firefighter ambush in Idaho by Kirk Siegler 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate
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