Look at a primate or a Neanderthal skull and compare it with a modern human's. Notice anything missing? We have one feature that primates, Neanderthals, archaic humans--any species, for that matter--don't possess: a chin. "In some way, it seems trivial, but a reason why chins are so interesting is we're the only ones who have them," says Nathan Holton, who studies craniofacial features and mechanics at the University of Iowa.
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