Headstart improves a variety of outcomes; it's irrelevant that IQ isn't one of them.
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There were no lasting impacts of any kind from Headstart. https://www.acf.hhs.gov/sites/default/files/opre/executive_summary_final.pdf …
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That's one study of one-year effects. There are a number of studies showing positive long-term effects, eghttps://www.brookings.edu/research/the-long-term-impact-of-the-head-start-program/ …
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It is a large, pre-specified government paid study with multiple year follow-up, not just 1. It's essentially as good as it gets.
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It's as good as it gets, but it still covers only the short term. Long-term studies may be less well controlled, but they're not nothing.
End of conversation
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Highlighted text is the antithesis of science. It says no one can prove a different cause. Imagine if that corruption were applied in law
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