A study of Norwegian conscripts found 20th century IQ gains reversed after 1975

Hacker News•Thu, Aug 6, 2026, 08:44 AM•2 min read

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Source: [Hacker News](https://scienceblog.com/t-a-study-of-730-000-norwegian-conscripts-found-the-iq-gains-of-the-20th-century-reversed-after-1975-falling-by-roughly-seven-points-a-generation-and-ruled-out-genetics-as-the-cause-by-comparing-broth/)

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