An X-ray of electrodes implanted in the brain of a Parkinson's patient at the Cleveland Clinic. Now deep brain stimulation like this is being tried experimentally in a few patients with chronic, serious anorexia. AP hide caption

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This image shows a human glial cell (green) among normal mouse glial cells (red). The human cell is larger, sends out more fibers and has more connections than do mouse cells. Mice with this type of human cell implanted in their brains perform better on learning and memory tests than do typical mice. Courtesy of Steven Goldman hide caption

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Scientists say that understanding how the cocktail party effect works could help people who have trouble deciphering sounds in a noisy environment. Guests make it look easy at a Dolce and Gabbana Lounge party in London in 2010. Paul Jeffers/AP hide caption

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A simple switch of ingredients made a big difference in how mice responded to experimental cancer vaccines. Andrei Tchernov/iStockphoto.com hide caption

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A guinea pig does its part for science and human relations by sitting on the lap of an autistic child. Erin Burnett/Courtesy of Maggie O'Haire hide caption

itoggle caption Erin Burnett/Courtesy of Maggie O'Haire

For some kids who grow up in poverty, the bond developed with Mom is especially important in dealing with stress. iStockphoto.com hide caption

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Perch exposed to the anxiety drug oxazepam were more daring and ate more quickly than fish that lived in drug-free water. Courtesy of Bent Christensen hide caption

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Car commercial? Nope. Jessica Richman, Zachary Apte (center) and William Ludington are looking to the crowd for money to fund uBiome, which will sequence the genetic code of microbes that live on and inside humans. Courtesy of uBiome hide caption

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The painkiller diclofenac is sold under several brand names in the U.S. and abroad, including Voltaren. Wikimedia Commons hide caption

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More than 400 guns, including these three, were turned in during a Dallas gun buyback program in January. But determining the effectiveness of such programs is difficult due to limits on gun-related research. Tom Pennington/Getty Images hide caption

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Movies like The Shining frighten most of us, but some brain-damaged people feel no fear when they watch a scary film. However, an unseen threat — air with a high level of carbon dioxide — produces a surprising result. Warner Bros./Photofest hide caption

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Nurse Christel Petersen inoculates a child in the South African Tuberculosis Vaccine Initiative study in 2011. Rodger Bosch/AFP/Getty Images hide caption

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