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traumatic injuries. Extroverts enjoy

wider networks of social support, but

commit more crimes. As Jung speculated

almost a century ago about the

two types, “the one [extroversion] consists

in a high rate of fertility, with low

powers of defense and short duration of

life for the single individual; the other

[introversion] consists in equipping the

individual with numerous means of

self-preservation plus a low fertility

rate.”

The trade-off theory may even apply

to entire species. Among evolutionary

biologists, who tend to subscribe to the

vision of lone individuals hell-bent on

reproducing their own DNA, the idea

that species include individuals whose

traits promote group survival is hotly

debated and, not long ago, could practically

get you kicked out of the

academy. But this view is slowly

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