 Rec0Man, Your estimates of subgroup IQ from the diasporas assumes that the diaspora is unselected, right? I find it hard to believe that the Brahmins in Silicon Valley are a respresentative sample of Brahmins from their region. Doesn't it seem more reasonable that they are an elite within the elite? I wish I could offer some correction for that. Possibly compare the entrance exam scores of Indians who emigrated to the US with those who did not. Or try to estimate regression to the mean in US Brahmin children. 