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  1. Sep 2021
    1. Continual engagement with the mental rigors of modern life coincided in many parts of the world with improving nutrition, rising living conditions and reduced exposure to pathogens. These factors produced a century-long climb in average I.Q. scores — a phenomenon known as the Flynn effect, after James Flynn, the political philosopher who identified it.

      The Flynn effect is the substantial and sustained increase in intelligence test scores over most of the twentieth century.

      Research seems to indicate that the effect is environmentally caused: https://www.pnas.org/content/115/26/6674