Slum dwellers near Calcutta get their water from a municipal pipe. Water coming out of the tap on the left is for bathing and so is untreated. The blue Zimba chlorinator is hooked up to the tap on the right, which is used for drinking water. Courtesy of Suprio Das/Zimba hide caption

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Dr. Margaret Hamburg will have served almost six years as FDA commissioner by the time she leaves, far longer than the recent tenure for chiefs of the agency. J. David Ake/AP hide caption

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Joe Kiani, addresses the second-annual Patient Safety, Science & Technology Summit in January 2014. Courtesy of the Patient Safety Movement Foundation hide caption

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Proton beam therapy can precisely target tumors to avoid harming surrounding tissue, advocates say. Blythe Bernhard/St. Louis Post-Dispatch/MCT/Landov hide caption

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The MD Brush has an unusual grip that automatically angles the brush head at 45 degrees. Meredith Rizzo/NPR hide caption

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The company Proteus has developed a computer that attaches to a pill and tracks the pill's absorption into the body. The technology has passed clinical trials. iStock hide caption

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Andreas Fhager, a biomedical engineer at the Chalmers University of Technology in Sweden, adjusts the Strokefinder device on a test subject's head. Gunilla Brocker hide caption

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Ed Damiano and his son David, 15, play basketball at home in Acton, Mass. Ed has invented a device he hopes will make David's diabetes easier to manage. Ellen Webber for NPR hide caption

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The dream of epilepsy research, says neurobiologist Ivan Soltesz, is to stop seizures by manipulating only some brain cells, not all. Steve Zylius/UC Irvine Communications hide caption

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