WITH THE PUBLICATION of the Science article in October 1990, the Minnesota Twin Study was solidly on the scientific map and the environment-is-everything dogma had been dealt a mighty blow. Bouchard's twins had provided statistical evidence, compelling to all but a few environmental diehards, of a genetic component to personality and behavior. He and his research team had been looking for signs of inherited traits, and they had found them—everywhere they looked. The notion of nature or nurture—which more and more people were increasingly realizing was a bogus dilemma—had been changed to nature and nurture, or, as the Minnesota group preferred to say, nature through nurture.

What the Minnesota group had produced were percentages ...

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