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Introverts. Extroverts have lives outside of academia. Both are honorable but introverts, obviously, focus a lot more on their job than extroverts usually do. There are a few exceptions, of course, like Feynman, but for every extroverted scientist/mathematician that has ever existed, there are ten introverted scientist/mathematicians. That is not to say that managing a life outside of academia while also doing it is impossible, it's just that it's a lot easier when you don't have to