Sen. Charles Grassley, R-Iowa, and a Democratic colleague have introduced a bill that would require drugmakers and medical device companies to disclose payments made to physician assistants and nurses who can prescribe their products. Brendan Smialowski/AFP/Getty Images hide caption

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Bayer HealthCare, of Whippany, N.J., brought Essure to market in 2002 as a nonsurgical alternative for women seeking sterilization. Bayer acknowledges the device can lead to complications, but says they are rare. Julio Cortez/AP hide caption

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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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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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