Good article. I read about half of The Bell Curve in my studies years ago, and concluded it was sloppy research with greatly overhyped conclusions, so I stopped reading it.

I liked your explanation about height. But this is also well documented. The average height of Chinese, South Korean, and Japanese people has grown faster than, and is converging toward, the average American in the last 120 years - as wealth and nutrition increase. And North Koreans are 1-3 inches shorter on average than South Koreans, despite identical DNA.