Zeer pot

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Information on Zeer pot can be found at Wikipedia. What's this?

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The Zeer pot, also known simply as a Zeer (in Arabic) or a pot-in-pot refrigerator, is a simple invention in Africa shows how to keep foods cool in hot, dry climates, the zeer pot.

An article in the online Science in Africa explains:

"The zeer is a large pot inside which fits another smaller pot with a clay lid. The space between the two pots is filled with sand, creating an insulating layer around the inner pot. The sand is then kept damp by adding water at regular intervals — generally twice a day — reducing the temperature within the inner pot."