The University of Engineering and Technology in Lima, Peru, commissioned this billboard, which uses reverse osmosis to transform Lima's humid air into drinkable water. It's already made thousands of liters in three months of operation. Refreshing!
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.
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