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CANNES, FRANCE - NOVEMBER 03: Founder of The Bill and Melinda Foundation and Microsoft chairman, Bill Gates arrives for the G20 Summit on November 3, 2011 in Cannes, France. The world's top economic leaders will attend the G20 summit in Cannes on November 3rd and 4th. The leaders are expected to debate current issues surrounding the global financial system in the hope of fending off a global recession and finding an answer to the Eurozone crisis. (Photo by David Ramos/Getty Images)

CANNES, FRANCE - NOVEMBER 03:  Founder of The Bill and Melinda Foundation and Microsoft chairman, Bill Gates arrives for the G20 Summit on November 3, 2011 in Cannes, France. The world's top economic leaders will attend the G20 summit in Cannes on November 3rd and 4th. The leaders are expected to debate current issues surrounding the global financial system in the hope of fending off a global recession and finding an answer to the Eurozone crisis.  (Photo by David Ramos/Getty Images)