The evaporating clay fridge is clever, cheap and does no harm to nature. Why can't more technology these days follow its example?

This smart preservation device for foodstuffs was invented in 1995 by Nigerian engineer Mohammed Bah Abba. The Pot-in-pot cooler consists of a small earthenware pot nestling inside a larger one with wet sand filling the space in between. As the water in the wet sand evaporates, it extracts heat from contents of the inner pot thus cooling them. The pot cooler is one of many clever ideas shown at the Cooper-Hewitt National Design Museum in New York in its in "Design for the other 90%" exhibition opening 4 May 2007.

Link: More Social Responsible Design

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