When design meets function, everyone wins.  

Due to an extremely arid climate, most of Peru is drought-stricken and millions of people are forced to subsist on impure drinking water. 

However, now the University of Engineering and Technologyin Peru has created the first advertising billboard in the world to make purified drinking water out of the humidity that naturally occurs in the air.

Very cool, right?  Advertising can, and should, be used for more than just selling things. It should exist in the real world and, just like each of us, should try to make life better.