“According to a recent study of the brains of identical and fraternal twins, differences in the amount of gray matter in the frontal lobes are not only genetically influenced but are significantly correlated with differences in intelligence.”

— Steven Pinker , book The Blank Slate

Source: The Blank Slate (2002), p. 44, emphasis added

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Steven Pinker 33

psychologist, linguist, author 1954

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