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Replying to @realitycalls8
Hair color itself probably useless (female ornamental effects, men literally name women after their hair color), except as a proxy for ancestry. We already know ancestry is predictive of aggression etc., though causal mechanism is disputed of course.
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Replying to @realitycalls8
There's a few more of these breeding experiments. Here's a new rat study.https://link.springer.com/article/10.1134/S1022795412100079 …
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