I wanted to tell it like it is, that they were right: it’s nerve-wracking being a teenager. But instead, I explained to them the importance of being a trusted friend, and that friendship made the teenage years fun, when true camaraderie grew and developed.

person’s own level of virtue is a tradeoff between the esteem that comes from cultivating a reputation as a cooperator and the ill-gotten gains of stealthy cheating. A social group is a marketplace of cooperators of differing degrees of generosity and trustworthiness, and people advertise themselves as being as generous and trustworthy as they can get away with, which may be a bit more generous and trustworthy than they are. The

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