Today, 790 million people — 11 percent of the world's population — live without access to clean water.
Two years ago, XPrize, an international nonprofit organization, announced a global competition enticing innovators to find a sustainable and affordable way to bring potable water to those who aren't privileged enough to have it now.
Skeptics told the competition organizers that it was impossible.
Image: XPRIZE/SKYWATER/SKYSOURCE ALLIANCE
