A refugee girl carries her laundry on her head after washing it in a polluted stream on World Water Day in a poor neighborhood on the outskirts of Islamabad, Pakistan, on March 22, 2013. The U.N. estimates that more than one in six people worldwide do not have access to 5 to13 gallons of safe fresh ater a day to ensure their basic needs for drinking, cooking and cleaning. (Photo by Muhammed Muheisen/Associated Press)
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