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Lots of things are “rooted” in dark places. Rocket technology developed in wartime Germany. Some pesticides came out of gas chambers. Agent orange is a herbicide now. Should we throw out everything developed by someone who holds a bad idea by today’s standards?

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I have yet to be convinced that comparisons of IQ between cohorts have as much practical utility as rockets or pesticides (on the contrary, the sole utility of intergenerational comparisons of IQ tests seems to be in highlighting the limitations of IQ as an objective measure of intellectual capacity...)

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