In fact the key prejudice that drives eugenics is something now Juan to be definitively false (that all "positive" traits are correlated, that physically healthy and beautiful people are also competent, virtuous and wise)https://twitter.com/Simon_Whitten/status/1228991252106039302 …
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Many of out beauty standards come from the Victorian era, where the best way to be sexy was to catch tuberculosis
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QI tests are used a lot too. Radiolab made the excellent podcast mini-series "G" about the subject and at some points come to the same conclusion : the most crucial point for our survival is diversity. Thanks for the thread!
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The main thing that doomed the American Indians was their _lack_ of genetic diversity (as they were descended from a small group of migrants who crossed the Ice Age Bering land-bridge) which made them horrendously vulnerable to Eurasian pathogens.
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