What is the oldest expertise that's been passed down from person to person? Is there a chain for flint-knapping for example?
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Given that coevolution is a slow process and walking wouldn't be key to early hominid babies (carried) but only useful for adults...
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And that it could be easily discovered by any able bodied hominid, I'm not sure it's the right answer. But maybe
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I don't think walking is an expertise: There's no ablebodied adult who doesn't walk. No culture seems to have lost this "skill"
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