10/28/2013 02:32 pm ET

Girls' And Boys' Brains: How Different Are They?


When my son was a toddler, his best friend, a girl, gave him a sparkling dancing Katrina doll for a birthday present. He'd apparently admired the doll at her house, but once he got it he never played with it – until the day I found him chasing his little brother around with the doll, which he'd managed to twist into the shape of a gun.

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