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New study: Biology, not parenting, to blame for selfish, insensitive teen behavior Published: October 16, 2013

The teen years are often fraught with door-slamming, eye-rolling and seeming insensitivity, even by kids who behaved kindly before, says the Wall Street Journal.

Some parents worry that they're doing something wrong, or that their children will never think of anyone but themselves.

New research shows that biology, not parenting, is to blame.

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