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Notes -
That faster development could be part of the cause of the spatial/logical intelligence gap, as faster development is (at least interracially) correlated with lower intelligence after the completion of puberty. I wonder if girls who get their periods later are consistently more intelligent, or if there are racial differences in average age of menarche?
IDK about the first part but the order in average age of first period is pretty much exactly what you'd expect- Asians slightly older than whites, who are older than Amerinds, who are older than subsaharans.
Black boys hit puberty earlier as well, BTW, and this probably explains a small part of black overrepresentation in athletics in the US- blacks are noticeably bigger at the ages where it starts to separate by skill.
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