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

itoggle caption Nicole Young/iStockphoto

In Virginia this summer, Arlington Public Schools transported students in poor neighborhoods to community libraries for group readings. Studies say children from low-income families may hear roughly 30 million fewer words by age 3 than their more affluent peers. Bill O'Leary/The Washington Post/Getty Images hide caption

itoggle caption Bill O'Leary/The Washington Post/Getty Images

Ah, the cinnamon swirl: They're beloved by the Danish, but the traditional recipe for these pastries may be too spice-laden for European Union law. iStockphoto.com hide caption

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Vera Wojtesta was one of 300 babies flagged by New York's newborn screening program as at risk of having life-threatening Krabbe disease. Ben Shutts/Courtesy of the Wojtesta family hide caption

itoggle caption Ben Shutts/Courtesy of the Wojtesta family

Though some people might need more of specific vitamins, multivitamins don't help most people, studies say. iStockphoto hide caption

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There's no evidence that triclosan and other chemicals in antibacterial soaps do a better job than plain soap and water, the FDA says. Kiichiro Sato/AP hide caption

itoggle caption Kiichiro Sato/AP

Being the littlest may mean more protection and care from parents, psychologists say. Getty Images/Image Source hide caption

itoggle caption Getty Images/Image Source

Trevor Watson, 14, says he hears gunshots in his Oakland neighborhood so often that "it doesn't even affect me anymore." Brett Myers/Youth Radio hide caption

itoggle caption Brett Myers/Youth Radio

Dartmouth defenders sandwich a New Hampshire wide receiver during a game in Durham, N.H., in 2009. Josh Gibney/AP hide caption

itoggle caption Josh Gibney/AP

Students at Northeast Elementary Magnet, in Danville, Ill., play around. Fewer than 1 in 5 parents polled said their kids were getting physical education daily. Seth Perlman/AP hide caption

itoggle caption Seth Perlman/AP