Here's some reading to get you started: https://en.wikipedia.org/wiki/Fertility_and_intelligence#Later_research https://en.wikipedia.org/wiki/Fertility_and_inte

Here's some reading to get you started: https://en.wikipedia.org/wiki/Fertility_and_intelligence#Later_research https://en.wikipedia.org/wiki/Fertility_and_intelligence#Lat... Also - If you think the Flynn effect (measured increases in average IQ over time) contradicts the hypothesis that low-IQ people have more kids, you're confused. Both can be true at the same time, if the Flynn effect is due to environmental changes and not eugenic breeding (which seems to be scientists' tentative conclusion right now).