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 that is, in fact, pretty close to one of the theories out there. (^_^)
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@Civis_Silas mmm hmm! it's not an accepted theory, but it's one of them. (^_^) -
@Civis_Silas (...and that we have chins at all.)
End of conversation
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