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mwengler comments on Open Thread, Feb. 2 - Feb 8, 2015 - Less Wrong Discussion
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I heard something years ago that stuck with me. In an optimum environment, 100% of human variation on everything would be genetic. So if you do everything you can environmentally to improve your kids intelligence, 100% of the variation left must be genetic. Similarly with height, musical ability, etc etc.
So whenever one finds that less than 100% of the variation in some positive trait is genetic, it means at least some of the population is not optimizing the environment to bring out that trait.
Not obviously relevant to the comment above, but on the same topic so I stuck it here.