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Berlin, Germany - November 11: German Development Minister Gerd Mueller (R) welcomes Bill Gates, Founder of Bill and Melinda Gates foundation in ministry of development on November 11, 2014 in Berlin, Germany. (Photo by Michael Gottschalk/Photothek via Getty Images)

Berlin, Germany -  November 11: German Development Minister Gerd Mueller (R) welcomes Bill Gates, Founder of Bill and Melinda Gates foundation in ministry of development on November 11, 2014 in Berlin, Germany. (Photo by Michael Gottschalk/Photothek via Getty Images)