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New research shows that biology, not parenting, is to blame for insensitive and selfish behavior by teenagers

Sue Shellenbarger

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