The Bell Curve nailed it and a lot of people knew it. It was just an “inconvenient truth” at the time.
I guess it still is.
Maybe if they released it again with the title, “A Real Inconvenient Truth”...
It’s still a big inconvenient truth. The authors still are afraid to talk about genetics and heritability. They remember what happened to Murray and Hernstein when they published The Bell Curve.
“Noble and Sowell have two theories about why poor children have smaller brains. One is that poor families lack access to material goods that aid healthy development, such as good nutrition and higher-quality health care. The other is that poor families tend to live more chaotic lives, and that stress could inhibit healthy brain development.”
They ignore the obvious in their paper. They have to or the paper won’t get published. If they mentioned genes they’d never get their paper published in a good journal - if at all.