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FRONTLINE/World investigates one of its own stories — "The Play Pump" — an apparently breakthrough idea to harness the energy of children to pump drinking water throughout remote areas of southern Africa. After FRONTLINE/World aired the story in 2005, major donors in the United States — and the U.S. government itself — launched a multimillion-dollar campaign to install the device in thousands of African schools and villages . Now, correspondent Amy Costello investigates what happened to those communities as the promise of the Play Pump fell short and the device's biggest American boosters began to back away from a technology they had once championed.