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I've read that the occipital bun is an anatomical feature of the Neanderthals,

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and only because modern humans (except sub-Saharan Africans) carry a few percent of Neanderthal DNA due to interbreeding, it also occurs in them, although "rarely".

20 physical traits you may have inherited from a Neanderthal

How rare is it, numerically?

How is the occipital bun defined, precisely? (All 3D objects will have the rearmost point)

Does Ryan Gosling have it?

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Is the occipital bun a matter of degree (big vs barely there), or is it binary: either you have it, or you don't?

I know that Sub-Saharan Africans do not have it, because they did not inherit Neanderthal DNA. Then how are their rear skull protrusions different, anatomically?

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In other words, I could not find a clear definition of this anatomical feature, and the one given on Wikipedia seems overly broad.

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