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But while Americans have been mailing in their saliva samples in order to find out what proportion of their genome is descended from Neanderthals, or whether or not they are likely to have dry or wet earwax, scholars have been busy overcoming statistical obstacles to produce scores based on the entire set of a million or more bits of DNA that predict what we call “quantitative traits”—those that fall on a continuum, like body-mass index or verbal intelligence.