I'm surprised by this recent Norway IQ study. Before 1975, later born children within a family scored higher. After, later born children scored lower. Unless I'm missing something, dysgenics shouldn't play a role here. What happened?
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Here's a possibility: smarter siblings increasingly avoided taking these tests in the cohort that was born after 1975? This is a military test that supposedly everyone must take, but I'm wondering if that's actually the case.
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Alternatively, people in more recent years are increasingly blowing off the test? Nutrition is also a good possibility. Whatever is causing declines in sperm counts (presumably some chemical exposure?) might be causing other problems.
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Nutritional changes?
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Definitely possible
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