I may not know karate, but I know how to use a baseball bat


People often compare education to exercise. If exercise builds physical muscles, then education builds “mental muscles.” If you take the analogy seriously, however, then you’d expect education to share both the virtues and the limitations of exercise. Most obviously: The benefits of exercise are fleeting. If you stop exercising, the payoff quickly evaporates. (…) Exercise physiologists call this detraining. As usual, there’s a big academic literature on it.

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