Beer pong and other drinking games are popular among teenagers, and play a role in binge drinking. iStockphoto.com hide caption

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Teenagers put in more than two hours a day of TV time on average, still more than what pediatricians say is healthy. iStockphoto.com hide caption

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I told him he would break his arm if he did that. But he did it anyway. iStockphoto.com hide caption

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Teenagers turn to their phones and social media to find rides. Tanggineka Hall/Youth Radio hide caption

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The X-ray reveals a blowdart lodged in a teenager's windpipe. Reproduced with permission from Pediatrics @AAP hide caption

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Soda bottles and household chemicals are sometimes used to make low-power bombs. iStockphoto.com hide caption

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Dylan Young, then 18, posed for a photo as a vehicle cruised by North Arlington, N.J., in June 2012. Young was in a fender-bender accident caused by being distracted while texting and driving. Julio Cortez/AP hide caption

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Brad McDonald and his 14-year-old daughter, Madalyn, are working to understand each other during her teenage years. Courtesy of Brad McDonald hide caption

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A young man places an oral swab into a solution to complete an HIV test during a free screening event in Washington, D.C. Brendan Smialowski/Getty Images hide caption

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