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Bill Gates, billionaire and co-chair and trustee of the Bill and Melinda Gates Foundation, gestures as he speaks during a session on day three of the World Economic Forum (WEF) in Davos, Switzerland, on Friday, Jan. 23, 2015. World leaders, influential executives, bankers and policy makers attend the 45th annual meeting of the World Economic Forum in Davos from Jan. 21-24. Photographer: Chris Ratcliffe/Bloomberg via Getty Images