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"Their average IQ has been measured at 108 to 115, one-half to one standard deviation above the mean. But statisticians have long known that a moderate difference in the means of two distributions translates into a large difference at the tails." - Stephen Pinker
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The Ashkenazi Jewish population bottlenecked down to like 350 people at some point. Even if you could somehow prove that they have higher IQ due to genes, it wouldn't really have any implications for a broader link for between race and IQ.
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