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Intelligence test scores are dropping, especially among wealthier families. In 579,379 Norwegian men, scores started falling first in sons of high‑income fathers and declined most in this group. Gains from expanded upper‑secondary education briefly slowed declines in lower‑income groups.
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Educational expansion and the hidden reversal of the Flynn effect—Differential trends across socioeconomic strata | PNAS

In recent decades, the United States and several European countries have seen a plateau and reversal of the population-level gains in cognitive tes...

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