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

itoggle caption 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

itoggle caption Bob Jordan /AP

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

itoggle caption Marie McGrory/NPR

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

itoggle caption 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

itoggle caption Bill & Melinda Gates Foundation