Alternate to what? I don't see anyone else having posited a causal explanation at all?
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Here's the causal explanation - there were different returns to intelligence in the ancestral environments of the different human species (as different genetically as wolves and coyotes). The human species from Africa have smaller brains and less intelligence.
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Covfefe Anon Retweeted Covfefe Anon
No, I pointed out that *you* were throwing around accusations of heresy. Your ability to misunderstand is remarkable.https://twitter.com/CovfefeAnon/status/1343280770962628609 …
Covfefe Anon added,
10:50 AM - 28 Dec 2020
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