A new study finds that radio waves from a cell phone can affect the metabolism of brain cells, though there is no evidence that the effect is harmful. Here, a pedestrian talks on her phone on a street in San Francisco. Justin Sullivan/Getty Images hide caption

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Jaime Guevara-Aguirre stands with some of the people who took part in his study of Laron syndrome in Ecuador. Courtesy of Valter Longo hide caption

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Gene Mutation Key To Ecuador Group's Health

A genetic mutation in a population in Ecuador seems to prevent diabetes and ward off cancer. It's also responsible for their short stature: most are under 4 feet tall.

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Elizabet Spaepen, University of Chicago

Malcom Brown (left) is hit by Jake Smith on a kickoff return during a high school state championship game in Arlington, Texas, in December. Sports medicine professionals and the NFL are calling for tougher regulations on head injuries sustained by young athletes. Matt Strasen/AP hide caption

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A hormone that impacts memory in rats likely does the same thing in other animals, like humans. S. Ugur Okcu/iStockphoto.com hide caption

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Modern bedbugs are increasingly resistant to pesticides. Some populations, in fact, can survive 1,000 times the amount of pesticide that would be needed to kill a traditional bug. Orkin LLC/AP hide caption

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People with autism have impaired feelings of trust and empathy, and early studies show that the hormone oxytocin could help. Steven van Soldt/iStockphoto.com hide caption

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Residents of Times Beach, Mo., were forced to leave their town in December 1982 because the chemical dioxin was found in the soil. Thirty years later, the Environmental Protection Agency can't decide how dangerous the chemical is. Bill Pierce/Time & Life Pictures/Getty Images hide caption

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Mono Lake, Calif., is home to a bacterium discovered by NASA scientists that can eat and grow on arsenic instead of phosphorous, one of the basic building blocks of life. The finding has implications for NASA's ongoing search for signs of life elsewhere in the universe. David McNew/Getty Images hide caption

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Our brains have chemical pathways that make us feel good when we eat, and really good when we eat sweet or fatty foods with high calories. Scientists see these same chemical pathways used in cases of drug addiction. Paul Ellis/AFP/Getty Images hide caption

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