http://rebuildingcivilization.com/content/busting-myths-about-zeer-pot
http://rebuildingcivilization.com/content/build-evaporative-refrigerator-no-moving-parts-no-electricity
http://en.wikipedia.org/wiki/Pot-in-pot_refrigerator
http://solarcooking.wikia.com/wiki/Pot-in-pot_cooler
http://rebuildingcivilization.com/content/build-evaporative-refrigerator-no-moving-parts-no-electricity
http://en.wikipedia.org/wiki/Pot-in-pot_refrigerator
http://solarcooking.wikia.com/wiki/Pot-in-pot_cooler
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