"If you become a father, you're not doing things for yourself anymore. You're thinking about someone else. And that is not a burden."

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Extroverts are more attuned to social rewards, so they are more likely to flash a smile for effect. A notable exception are introverts - like me - whom I call "socially accessible" introverts. We have been trained well to smile and nod, which can place a burden on our processing efforts.

— Laurie Helgoe