Over at Hackszine.com, Jason wrote up a great post about the evaporation fridge invented by Emily Cummins:

This solar refrigerator, invented by Emily Cummins, is a brilliantly simple solution for keeping food cool in a hot, dry environment. It's basically a metal cylinder surrounded by wet material, surrounded by a mesh sleeve to hold it all together.

It's encouraging to think that important, real-world problems are still out there to be solved with a bit of ingenuity and the sort of materials that are taking up space in the corner of your garage.

Link to full Hackszine article
Link to Emily Cummins' Site