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/ …
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Replying to @Civis_Silas
@Civis_Silas that is, in fact, pretty close to one of the theories out there. (^_^)1 reply 0 retweets 0 likes -
Replying to @Civis_Silas
@Civis_Silas mmm hmm! it's not an accepted theory, but it's one of them. (^_^)2 replies 0 retweets 0 likes
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