Kids who can't resist temptation early on may have trouble with it throughout their lives. hide caption

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Trevor Reese, 13, gets his diphtheria, tetanus and pertussis booster shot from pediatric nurse practitioner Jenny Lu in Tustin, Calif., in August. Jae C. Hong/AP hide caption

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Richard Meehan, 16, with his car at his home in Shelton, Conn in 2008. Researchers say tougher licensing laws have led to fewer fatal car crashes involving 16-year-old drivers. Bob Child/ASSOCIATED PRESS hide caption

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