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WASHINGTON, DC - March 10: Bill Gates, co-chairman of the Bill and Melinda Gates Foundation, during the Senate Foreign Relations hearing on global health programs. He testified with former U.S. President Bill Clinton, chairman of the William J. Clinton Foundation. (Photo by Scott J. Ferrell/Congressional Quarterly)

WASHINGTON, DC - March 10: Bill Gates, co-chairman of the Bill and Melinda Gates Foundation, during the Senate Foreign Relations hearing on global health programs. He testified with former U.S. President Bill Clinton, chairman of the William J. Clinton Foundation. (Photo by Scott J. Ferrell/Congressional Quarterly)

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