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From 1860 to 1940 the increase in average height among Londoners paralled an increased in brain weight, growing about 0.66 grams per year: https://sci-hub.se/https://www.tandfonline.com/doi/abs/10.1080/03014467700007142 …pic.twitter.com/Pj5aJ3F71g
Similarly, in Americans the size of the cranial vault (basion-bregma height) has been increasing steadily in whites and blacks, while the face has become somewhat narrower. https://sci-hub.se/https://onlinelibrary.wiley.com/doi/abs/10.1002/(SICI)1520-6300(200005/06)12:3%3C327::AID-AJHB3%3E3.0.CO;2-1 …pic.twitter.com/6EjFB2Bztz
Not necessarily, or Eskimos would be the smartest people on earth. But it would seem a good bet that some of the really large Flynn effect is due to nutrition induced brain changes.
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