One additional year of education raises your intelligence by one to five points on the standard IQ scale. https://psyarxiv.com/kymhp/ pic.twitter.com/9TVlUo9lt0
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It's clearer in the paper than in your excerpt. They need to draw a distinction between earlier starting and later finishing.
Lots of interventions can temporarily raise IQ. None have been shown to be long term.
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