And an aside: Deniers of the heritability of intelligence alway resort to things like, "Ashkenazi Jews have higher intelligence only because they have a tradition of literacy that other people lack." Well and good, but they're missing the point that this literacy tradition affected the reproduction of individuals most adaptable to literacy. Over the centuries, then, Ashkenazi Jews were selected for literacy aptitude, which no doubt correlates with intelligence. That, after all, is how evolution works.
Here's a guest post by Matt Bailey on the subject:
Reality-A human can just about double, occasionally triple their starting strength level through dedicated training, but IQ is much less flexible. Assuming it isn't lowered by being subjected to extreme famine at a young age, what you are born with is pretty much what you've got to work with. For decades our country has been run by people who assume it DOES work like the bench press.
"Oh don't worry, if we let all the Blue Collar jobs flee overseas we'll just train everyone to be White Collar workers!"
Doesn't work that way, absolutely doesn't work that way, and acting as if it works that way creates harmful policies.
A guy with an IQ of ~90 and good hands didn't ask to be born that way, any more than Stephen Hawking asked to be a genius in a wheelchair. Our policies in America increasingly refuse to protect the former from international competition and make use of what he does have to offer, instead we treat him like he's lazy, broken, or plain no good because he can't just learn to be a programmer or an accountant if his factory gets shipped to Mexico. Then the ruling hairdos and eggheads in this country will call him ignorant if he'd rather vote for Trump than fall from a formerly prosperous middle class into a Third World peasant status.
Quibcag: Since this is a sciency post, the illustration is my favorite anime scientist girl, Rika Shiguma of Haganai (はがない).