I love low-tech devices -- stuff that doesn't need electricity, refined fuel, a radio signal, or software for it to work. Windmills, mechanical clocks, analog thermometers, retractable tape measures. Well, here's one for the ages, right up there with invention of the spear and the discovery of fire. It's a pot-in-pot cooling/food preservation system that uses earthenware pots, sand and water.
Apparently the basic technology (which relies on the thermodynamic effects of evaporation) has been around for centuries, although Mohammed Bah Abba seems to have improved upon it with his design. The more I think about it, the more I want one of these!
Brought to my attention via Guy Kawasaki's How To Change The World blog.
