The broad avenues of Pakistan's capital empty out after dark and prove irresistible to young drag racers. Asad Zaidi/Bloomberg via Getty Images hide caption

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Aniket Sathe, 15, is in a program that's trying to persuade India's boys to treat girls as their equals. Here he's pictured with his younger sister, Aarati, 12, waiting for the rain to stop before walking her to school. Poulomi Basu / VII Photo/for NPR hide caption

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Yolanda Roberson, who directs the Empowerment program, teaches a class at a Boys and Girls Club in the Bronx. The classes are funded by the state of New York. Robert Stolarik/Courtesy of Youth Today hide caption

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Physical exercise, diet and supportive counseling are the first steps of any weight-loss program. But sometimes that's not enough to take large amounts of weight off, and keep it off, doctors say. 13/Ocean/Corbis hide caption

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Zanele Themba (on the left with the pink backpack strap) admires American teens because they "know what they want and go for it." She's posing with classmates from the Sapphire Secondary School who participated in a model U.N. in Johannesburg. Courtesy of Youth@SAIIA hide caption

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She's a teenager with a cellphone, surfing the Internet. And she's a Syrian refugee who works in the fields up to 14 hours a day. That's the new life of 15-year-old Fatmeh, seen here in the living room area of her family's makeshift shelter. Dalia Khamissy for NPR hide caption

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Teenage girls gather in August outside an ice cream shop in Portland, Ore. A new Pew Research Center study finds that while teens use social media and other digital tools in all aspects of their romantic relationships, most still initially meet — and break up with — their love interests face-to-face. Beth Nakamura/The Oregonian/Landov hide caption

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People who have easy access to firearms are about three times more likely to kill themselves than people who don't have access to guns, a recent study from the University of California, San Francisco indicates. iStockphoto hide caption

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No gambling here: When asked to weigh financial choices, teenagers were more likely to make careful choices than were young adults. David Chestnutt/Ikon Images/Corbis hide caption

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