It was more of a general rebuttal to the idea of "the numbers move so it must be genetic".
The study you linked was interesting but adopted kids are an abnormal case to begin with and the effect indicated was tiny compared to societal things IMO.
The study you linked was interesting but adopted kids are an abnormal case to begin with and the effect indicated was tiny compared to societal things IMO.
However, a ray of hope in the study is that, even if you take its confidence intervals at face value (I don't), then there is quite a bit of room for improvement in the nurture sphere, as the black/white IQ test gap is generally much larger than this when not as carefully controlled as this study.