Well, the assumption that humans stopped changing in the Pleistocene was always obviously false. You won't find many people who will admit to making that assumption, but there it is anyway, strewn through their works. It made a useful assumption for some people, in that they could examine so-called universals instead of more messy variations. But those variations are proving to be the most interesting frontier of behavioral science. Some of them have been under strong selection, perhaps showing the adaptive reactions of minds to new social and cultural systems of the Holocene.
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