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The Flynn effect: a rapid increase in IQ through most of the 20th century. https://en.wikipedia.org/wiki/Flynn_effect … IQ tests are periodically renormed because of it.
The effect is extremely large - eg a 14 point gain over 66 years in Britain.
That's why I wrote 20th Century. It still seems to be contentious why it happened, & why it's slowed down or stopped.
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