In discussing the genetic and environmental determinants of individual differences in intelligence and educability, with their implications concerning social-class and race differences, I must first emphasize the tentative nature of our knowledge on these topics. Indeed, my main thesis is that we do not know nearly as much as we should about these subjects, and I am urging researchers in the behavioral and biological sciences to make a large-scale effort to come to grips with the important questions in this area.
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Arthur R. Jensen (1968) studied this question.
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