27 Feb 13

The University of Engineering and Technology in Lima, Peru, decided to pull off a clever engineering stunt to attract a new class of techie do-gooder students: create a billboard on the Pan-American Highway that generates potable water out of thin air.

It almost never rains and villagers nearby are challenged by the lack of fresh water. But atmospheric humidity, regularly as high as 98%, is thick with potential droplets.

Using five generators at the site, the billboard has already produced thousands of liters of free water in its first three months.