Almost half of high-schoolers have had sexual intercourse, but teens almost never ask their doctors about sexual health. Nicole Young/iStockphoto hide caption

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Solid friendships can help buffer life's stress. iStockphoto hide caption

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Maggie Starbard / NPR

When researchers at Weill Cornell Medical College scanned teenage brains, they found that the area that regulates emotional responses has to work harder to keep impulses in check. Courtesty Kristina Caudle/Developmental Neuroscience hide caption

toggle caption Courtesty Kristina Caudle/Developmental Neuroscience

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

toggle caption Reproduced with permission from Pediatrics @AAP

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