Michael Arnott, of Cambridge, Mass., says he used to have trouble staying awake on long drives. Sleep specialists discovered he has obstructive sleep apnea, though not for the most common reasons — he isn't overweight, and doesn't smoke or take sedatives. M. Scott Brauer for NPR hide caption

itoggle caption M. Scott Brauer for NPR

Bacillus subtilis may look like pasta under the microscope, but the bacteria are common in the gut of humans. Could the microbes be contributing to our belly fat? Too soon to tell, scientists say. BSIP/UIG via Getty Images hide caption

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Can playing the Project Evo game really improve the brain's ability to deal with distractions? Its manufacturer thinks so. Courtesy of Akili hide caption

itoggle caption Courtesy of Akili

Dyha Gresham (front, left), her older sister Briceshanay (in back) and Briceshanay's daughter Uri stand in their New Orleans home with the family's cat Sugar-Pepper and dog Selena. After Katrina, Briceshanay says, she relied on theater and the arts to help her "move through terrible and difficult times." Edmund D. Fountain for NPR hide caption

itoggle caption Edmund D. Fountain for NPR

We all get by better with a little help from our tunes. iStockphoto hide caption

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Rates of unintended pregnancy among young women in the military are about 50 percent higher than among young women in the general population, research suggests. iStockphoto hide caption

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A worker washes the exterior of a Portland Loo in Portland, Ore. San Diego installed two of the loos earlier this year. Rick Bowmer/AP hide caption

itoggle caption Rick Bowmer/AP
Lorenzo Gritti for NPR

Workers for the Safe Streets violence interruption project including Gardnel Carter, center, talk with Baltimore residents in 2010. Kenneth K. Lam/MCT via Getty Images hide caption

itoggle caption Kenneth K. Lam/MCT via Getty Images