By ensuring vaccines are invented and distributed, Bill Gates says, his foundation is dramatically reducing the number of childhood deaths in poor countries. Marie McGrory/NPR hide caption

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Marie McGrory/NPR

Why Bill Gates Fights Diseases Abroad, Not At Home

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Satya Nadella, who's reportedly in line to be Microsoft's next CEO. Stephen Brashear/AP hide caption

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Stephen Brashear/AP

One experimental condom has tabs on either side so it's easier to put on in the dark. Courtesy of California Family Health Council hide caption

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Courtesy of California Family Health Council

Those are the hands of David Bradley, an original member of the IBM PC team and the inventor of the control-alt-delete function, hitting the right keys. Bob Jordan /AP hide caption

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Bob Jordan /AP

There's no better deal than getting polio cases down to zero, philanthropist Bill Gates says. Marie McGrory/NPR hide caption

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Marie McGrory/NPR

Why Bill Gates Thinks Ending Polio Is Worth It

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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 Lee Jin-man/AP hide caption

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Lee Jin-man/AP

Bill Gates, co-founder of the the Bill & Melinda Gates Foundation, checks out a toilet demo at the Reinvent the Toilet Fair in Seattle, Wash. The festival featured prototypes of high-tech toilets developed by researchers around the world. Bill & Melinda Gates Foundation hide caption

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Bill & Melinda Gates Foundation

Bill Gates Crowns Toilet Innovators At Sanitation Fair

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