In Uganda, from Eye on the Equator:
Fridges in a country where electricity is scarce, expensive and fickle, a collective of women came up with an idea to use charcoal for something more than just cooking supper. The cordless fridge weighs about 70lb but can be built for less than $20. The bottom consists of a metal sheet, while the walls and the lid are filled with charcoal, kept in place by a wire-mesh. A plastic bucket is placed on top and needs to be regularily refilled with water, which then drains via cotton strings through the whole construction and keeps the coals moist, thus maintaining the temperature inside at 5-10° Celsius
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