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found that nomads who inherited the

form of a particular gene linked to extroversion

(specifically, to novelty-seeking)

are better nourished than those

without this version of the gene. But in

settled populations, people with this

same gene form have poorer nutrition.

The same traits that make a nomad

fierce enough to hunt and to defend

livestock against raiders may hinder

more sedentary activities like farming,

selling goods at the market, or focusing

at school.

Or consider this trade-off: human extroverts

have more sex partners than introverts

do—a boon to any species

wanting to reproduce itself—but they

commit more adultery and divorce

more frequently, which is not a good

thing for the children of all those couplings.

Extroverts exercise more, but introverts

suffer fewer accidents and

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