Research on the Flynn effect indicates that

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Research on the Flynn effect has shown that IQ scores have been increasing between generations, largely due to better nutrition, education, and the use of technology. This presents a challenge to the idea that ethnic differences in IQ are mostly due to genetics, as environmental factors have such a strong impact on IQ. While the Flynn effect has not been studied as extensively in developing nations, there is some evidence of similar gains in IQ. The black-white gap in IQ is a separate issue from the Flynn effect and its impact on ethnic differences in IQ.

Research on the Flynn Effect Indicates That