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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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Courtesy of Suprio Das/Zimba

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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J. David Ake/AP

FDA Commissioner Hamburg Grappled With Global Challenges

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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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Courtesy of the Patient Safety Movement Foundation

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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Blythe Bernhard/St. Louis Post-Dispatch/MCT/Landov