Cob: Off topic-pot in pot earthern refrigerator

[Arlie Haig]

Here is a link to a wonderful idea, especially important to people off the
grid and in dry climates.
http://www.time.com/time/2001/inventions/basics/inpot.html
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In rural northern Nigeria, there are no refrigerators. Most people don't
even have electricity. So perishable food must be eaten immediately, or it
will go to waste. Mohammed Bah Abba, a local teacher, has developed an
ingenious solution: the Pot-in-Pot Preservation Cooling System. A small
earthenware pot is placed inside a larger one, and the space between the two
is filled with moist sand. The inner pot is filled with fruit, vegetables or
soft drinks; a wet cloth covers the whole thing. As water in the sand
evaporates through the surface of the outer pot, it carries heat, drawing it
away from the inner core. Eggplants stay fresh for 27 days, instead of the
usual three. Tomatoes and peppers last for up to three weeks. A recipient of
the Rolex Award for Enterprise, Abba, 37, who hails from a family of
potmakers, is using his $75,000 award to make the invention available
throughout Nigeria. He has already sold 12,000.

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Arlie