[squibonpig]

I saw in the article that male pattern baldness became way less common over the studied period. Their definition of "way less" was 1-2%. Even if it wasn't the case that, lacking natural weapons, generalizable cognitive faculties are highly advantageous for our species regardless of factors like climate, there's not any real reason to figure cognitive changes would occur way faster than the 1-2% reduction in MPB. So is the argument that some large scale population has a mean IQ that differs by 1-2%? That's vastly less than the impact of poverty or childhood nutrition.