Sunday, 31 January 2016

Humans Are The Only Animals With Chins, And No One Knows Why

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Animals don't have chins, except for us. The lower jaw of a chimpanzee or gorilla slopes backwards from the front teeth. So did the jaw of other hominids like Homo erectus. Even Neanderthal jaws ended in a flat vertical plane. Only in modern humans does the lower jaw end in a protruding strut of bone. So, why do chins exist?

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