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character of a reedy, nose-blowing

young man is shorthand for the hapless

but thoughtful kid who gets good

grades, is a bit overwhelmed by the social

whirl, and is talented at introspective

activities like poetry or astrophysics.

(Think Ethan Hawke in Dead Poets

Society.) Kagan even speculates that

some men prefer women with fair skin

and blue eyes because they unconsciously

code them as sensitive.

Other studies of personality also support

the premise that extroversion and

introversion are physiologically, even

genetically, based. One of the most

common ways of untangling nature

from nurture is to compare the personality

traits of identical and fraternal

twins. Identical twins develop from a

single fertilized egg and therefore have

exactly the same genes, while fraternal

twins come from separate eggs and

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