Study Suggests Chins Evolved as Faces Shrank

April 15, 2015 5:18 PM

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IOWA CITY, IOWA—Scientists have debated for more than a century why modern humans are the only primates to sport chins.

Young modern human children have nearly imperceptible chins, similar to Neanderthals, but they grow chins as they mature. Nathan Holton and colleagues at the University of Iowa measured the faces and crania of nearly 40 people, ranging in age from toddler to adult, and found that mechanical forces s...

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