One thing I never hear anyone talk about is how redlining and historic racism could have a measurable impact on IQ. If we're restricting ethnic minorities to certain areas often often known to be contaminated with lead and neurotoxic chemicals, and then factor in the drug war and mass incarceration removing a large portion of the African American male population they'by wrecking the family structure. Are we surprised that these social determinants of health could have a measurable impact on IQ of a population? Personally I think if we were to properly address these social determinants of health we'd see disparities in IQ start to erode over a generation.,(reply>), @nwogamesalert it's the neurotoxic heavy metals in the water and soil like lead, cadmium, and mercury. The neighborhoods where ethnic minorities were restricted to in the days of redlining were often near landfills and areas contaminated by industry. Generations later most of those families are still there. It's a social determinants of health thing, get the population of the contaminated environment and we'll probably see the disparity in IQ disappear over a generation or two.,(reply>), How come these disadvantaged badly fed people can become great athletes? One would think that the poisoning and cheap food would impact their physical abilities as much as their intelligence?