We're the only animals with chins, and no one knows why - http://www.theatlantic.com/science/archive/2016/01/were-the-only-animals-with-chins-and-no-one-knows-why/431625/ …
@Civis_Silas mmm hmm! it's not an accepted theory, but it's one of them. (^_^)
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@Civis_Silas (...and that we have chins at all.)Thanks. Twitter will use this to make your timeline better. UndoUndo
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@Civis_Silas (~_^) there's a bunch of theories in the article. everything from chewing to talking to taking a punch.Thanks. Twitter will use this to make your timeline better. UndoUndo
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