IQ differences by race in the US.
(twitter.com)
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genetics is not linear, it changes in response to stress, not time.
jews changed genetically a lot in a matter of a few centuries because they kept getting hit with pogroms.
Does a pogrom cause additional mutations to form, or make it more likely that said mutations are beneficial?
it's that the smarter jews escape while the dumber ones do not.
have that happen over & over & you'll end up with a skewed population.
The dumb ones don't incite pogroms, so you've got competing impulses.