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WASHINGTON, DC - JULY 23: Bill Gates speaks during a panel discussion at the 19th International AIDS Conference at The Walter E. Washington Convention Center on July 23, 2012 in Washington, DC. (Photo by Kris Connor/FilmMagic)

WASHINGTON, DC - JULY 23: Bill Gates speaks during a panel discussion at the 19th International AIDS Conference at The Walter E. Washington Convention Center on July 23, 2012 in Washington, DC. (Photo by Kris Connor/FilmMagic)