This will change the world

Found on BoingBoing today:
A Nigerian man has won himself a truckload of money for inventing a refrigerator that runs without electricity. His invention is a pot-in-pot system that uses evaporating water to keep food cool. Much like your Mom used to put a wet cloth on your forehead to combat a fever, this refrigerator is kept cool by water evaporating out of wet sand that fills the gap between two differently-sized pots placed one inside the other. Foods that would only last days normally can now last weeks. This has profound consequences. Women who had to go to the market every single day to buy and sell food can now attend school. This will change the world.
Here's the link to the article at Hinterlands.cc