Enlarge this image Maria Fabrizio for NPR Maria Fabrizio for NPR My 8-year-old daughter is a fourth-generation perfectionist. In my family, the…
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biological traits
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Enlarge this image Giordano Poloni/Ikon Images/Getty Images Giordano Poloni/Ikon Images/Getty Images When scientists first read out the human genome 15 years ago,…