re: This book is gonna cause controversy

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I think the environmental and developmental factors affecting the evolution of societies having some effect on the intelligence gap (especially nutrition and how early the division of labor appears) makes more sense than the intelligence gap simply being 100% genetic.

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you're separating 2 things that don't need to be separated

and it's probably not 100% genetic, but somewhere north or 85-90% is likely

but the advancement of intelligence is determined through the structure of society. in terms of genetics, valuing intelligence leads intelligent people to breed amongst themselves, while less intelligent people are left to breed amongst themselves. as my friend said in law school, "we keep evolving, but they've been the same for 500 years"

also, there is a growing scientific body of evidence that is confirming that certain parts of our DNA do retain memories. this explains instinct pretty well, but it also explains why a line of culturally-superior people will create genetically superior people over time