I came upon an interesting video on the youtube.
The capital city of Peru, Lima, has two inches of rainfall a year which makes people to search water from the ground to build wells. But Peru's atmospheric humidity is roughly 98%, indicating that the air is filled with water.
The students from UTEC(Universidad de Ingenieria & Technologia) came up with cool idea of making a billboard which extracts moisture out of the humid air and turns it into potable drinking water.
The technology behind the mechanics are in the video. How cool it would be to fill up your tumbler from the billboard post from the street!
Images: Google images
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