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[quote:Chromatophore:MV81MTcyNzExXzk1MTkzNTA0X0JFOTc1NERD] https://en.wikipedia.org/wiki/Yakhchāl [i] Yakhchāl (Persian:"ice pit"; yakh meaning "ice" and chāl meaning "pit") is an ancient type of ice house that functions as an evaporative cooler. The structure had a domed shape above ground and a subterranean storage space. It was often used to store ice, but sometimes was used to store food as well. The subterranean space coupled with the thick heat-resistant construction material insulated the storage space year round. These structures were mainly built and used in Persia. Many that were built hundreds of years ago remain standing.[1][/i] [youtube] https://youtu.be/tnJms_3Gbuk[/youtube] [/quote]
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They say only 3% of earths water is fresh…….
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