Bill Gates says that in the dispute between Apple and the FBI over a court order to unlock an iPhone, he sides with the FBI. Other tech company executives have sided with Apple — including Facebook's Mark Zuckerberg. Seth Wenig/AP hide caption
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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. Jim Watson/AFP/Getty Images hide caption
Health workers suit up for Ebola duty in Monrovia, Liberia. John W. Poole/NPR hide caption
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 hide caption
The birth of vaccines: Photographer Alexia Sinclair portrays Dr. Edward Jenner giving John Phipps the world's first vaccine, for smallpox, in 1796. Courtesy of Alexia Sinclair hide caption
Tom Hiddleston takes the Ice Bucket Challenge. The actor is one of many stars taking part in the campaign to raise money for ALS. via YouTube hide caption
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
Satya Nadella, Microsoft's next CEO. Stephen Brashear/AP hide caption
Satya Nadella, who's reportedly in line to be Microsoft's next CEO. Stephen Brashear/AP hide caption
Bill Gates at an event held by his foundation in Berlin last November. Maurizio Gambarini /EPA/Landov hide caption
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
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
Larry Ellison, CEO of Oracle, is No. 3 on the Forbes 400 list of the wealthiest Americans. Stephen Dunn/Getty Images hide caption
Microsoft CEO Steve Ballmer speaks at the Microsoft "Build" conference in San Francisco in June. Robert Galbraith /Reuters/Landov hide caption
There's no better deal than getting polio cases down to zero, philanthropist Bill Gates says. Marie McGrory/NPR hide caption