What about siblings raised together and Identical twins raised together?
Whether or not IQ is genetic is a somewhat different issue than whether IQ differs by groups . In that regard, it is hard to know the extent to which differences across groups is nature versus nuture versus test-specific knowledge. I certainly have no way of knowing. At this point, I am inclined to believe that there is no good way of sorting it out and that researchers should explore other topics. Plus the fact, I am not sure what difference it makes.

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