The most remarkable examined about 2,000 pairs of American twins who served in World War II, plus their grown children. The results? Genes matter a lot for educational success. If you’re more educated than four out of five people, you can expect your separated identical twin to be more educated than three out of four. Upbringing makes little difference. Only two nurture effects stand out in the veteran twins study. First, if your father is a professional or manager instead of an unskilled worker, you typically complete one more year of education. Second, every extra sibling depresses your
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This seems like clear selection effect rather than the normal definition of nature
