The Minnesota Transracial Adoption [1] study is something that, for better or for worse, changed my outlook. It was a major and longterm study designed to try t

The Minnesota Transracial Adoption [1] study is something that, for better or for worse, changed my outlook. It was a major and longterm study designed to try to prove once and for all that environmental factors were the dominant factor in the correlation between race and IQ. The study followed the results of well to do white parents adopting children of black, half black, indigenous/asian, and white ancestry. In it they controlled for location, income, family stability, age of the adopted children, etc -- as many environmental variables as they could. The problem is that the study ended up showing the exact opposite of the desired outcome. By age 17 the difference in IQ between an adopted black child and an adopted white child was 18 points. Interestingly even adopted white children and the biological white children born to well to do parents showed a substantial 4 point difference in IQ which could be explained by genetic differences in those who end up of the means to adopt children, and those who end up in situations where they're left to give away their children for adoption. There was even a phenomenal accidental control. A number of the adopted children originally identified as having two black parents actually had one white and one black parent. And these children fit the IQ outcomes of the other half-black half-white children, which was about 10 points above the children from two black parents. This means even though the parents thought the children came from two black parents, and the children themselves also thought they came from two black parents - their performance mapped to their genetic background and not their environmental assumption. The authors have tried to undermine the results of their own study in two main ways. The first is by suggesting that differences could be attributable to prenatal environmental differences. This not only defies belief given the differences and extreme consistency, but if the authors actually believed this, it would have made the entire study, which went on for nearly 2 decade, completely pointless. The other is suggesting that skin color can create environmental differences. This is a much stronger argument against the results. However it also suffers from the same post-facto rationalization, but even more importantly -- this hypothesis is also strongly undermined by the accidental control group of half black children. Given their misidentification it's safe to say that these children did not have strongly indicative transracial features. And in any case they would have identified as 100% black given that's what they thought they were. I think that this study's results are precisely why there have been no further studies, of the same scale, performed on the topic. The results are not what we want to believe. [1] - https://en.wikipedia.org/wiki/Minnesota_Transracial_Adoption_Study https://en.wikipedia.org/wiki/Minnesota_Transracial_Adoption...