President Obama (from left), French President Francois Hollande and Microsoft co-founder Bill Gates applaud a speech during the Mission Innovation event at the UN conference on climate change Monday in Paris.
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Cellphones are everywhere in the developing world, as this Nairobi street scene shows. Bill and Melinda Gates believe the phones can be used for everything from farmer education to instant banking.
Simon Maina/AFP/Getty Images
This handshake between South Korean President Park Geun-hye and Microsoft founder Bill Gates sparked debate over whether the American — who kept his left hand in his pocket — had been rude. Other photos clearly show Gates' hand in his pocket.0