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Eric Goosby, United States Global AIDS coordinator, says field testing is necessary and urgent to determine if HIV testing-and-treating services are feasible. Brendan Hoffman/Getty Images hide caption

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Former Speaker of the House Newt Gingrich and former Massachusetts Gov. Mitt Romney chat after finishing a GOP debate in Sioux City, Iowa, earlier this month. Scott Olson/Getty Images hide caption

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Laurel Fontaine, 16, (left) and her twin sister Heather. When Laurel was 11 years old, she suffered a stroke that destroyed 80 percent of the left side of her brain. The singing therapy helped her regain the ability to speak. Ellen Webber for NPR hide caption

itoggle caption Ellen Webber for NPR

Experiences in youth shape our health in old age. That's the key lesson from the world's longest-running medical study. iStockphoto.com hide caption

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A Transportation Security Administration volunteer demonstrates a full-body scanner at Chicago's O'Hare International Airport in March 2010. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images