By some people he means researches mentioned in this Wikipedia article (https://en.wikipedia.org/wiki/Heritability_of_IQ#Heritability_and_caveats https://en.wik

By some people he means researches mentioned in this Wikipedia article (https://en.wikipedia.org/wiki/Heritability_of_IQ#Heritability_and_caveats https://en.wikipedia.org/wiki/Heritability_of_IQ#Heritabilit...).