Why We Have Chins 

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. “It’s unique to us.”

Notice how the modern skull, on the left, has a point at the bottom of the face compared to the Neandethal-era skull on the right. The reason: Only modern humans have chins.

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