WASHINGTON, DC - DECEMBER 03: Bill Gates, Microsoft Chairman and co-chair of the Bill and Melinda Gates Foundation, sites down for a meeting with House Foreign Affairs Committee members in the Rayburn House Office Building on Capitol Hill December 3, 2013 in Washington, DC. The world's richest person valued at about $77.7 billion, Gates was meeting with the committee to discuss the work of the foundation around the world. (Photo by Chip Somodevilla/Getty Images)