By equating polygenic Z scores for education to the IQ scale (mean white score = 100; SD = 15) I was able to tenatively assign very rough “genetic” IQs to 11 populations and a very clear pattern emerges. Those with cold climate ancestry (Mongoloids) average higher IQs than those with temperate climate ancestry (Caucasoids) who in turn average higher IQs than those with tropical ancestry (Negroids).

But within each broad climate category, those who made the neolithic transition average much higher IQs than those who generally remained hunter/gatherers.

So the selection pressures of going from the tropics to Northern Siberia added up to 15 points to genetic IQ on average, but then transitioning to agriculture and subsequent civilization added up to another 20 IQ points.

This makes sense because after 25 million years living as tropical hunter-gatherers, leaving the tropics and adopting agriculture each would have selected for enormous adaptability.

This helps explains why despite our species being a few hundred thousand years old, we didn’t discover agriculture until 10,000 years ago, didn’t invent civilization until a few thousand years ago, and didn’t start the industrial revolution until a few hundred years ago. We were waiting for the IQ points

Rushton writes:

Agriculture ancestryHunter/Gatherer ancestry
MONGOLOIDSEast Asians IQ 105

Native Americans IQ 85
CAUCASOIDSAshkenazi Jews IQ 105

Whites IQ 100


South Asians IQ 95

Arabs IQ 90


Cro-Magnon IQ 80

NEGROIDSBantu IQ 80

Pygmies IQ 80


Australian aboriginal IQ 70


Bushman IQ 70