@rcownie doesn’t argue it’s impossible because he knows the math. It’s impossible because he finds it morally reprehensible. But we could deduce that from the pronouns in his bio.
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Once you've got effective transmission of culture and hence the highly directed and very rapid mechanisms of cultural evolution, then it reduces a whole lot of other selection pressures, yes.
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Vikings didn't need to evolve fur b/c they could wear woolen clothes, they didn't need to evolve flippers b/c they could build boats, and they didn't need to grow sharp claws b/c they had iron swords and axes. Culture is a BFD.
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the invention of language *reduced* the selective pressure for intelligence - sure.