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Another cool old tech, pot in pot evaporative coolers. I've rabbit holed this particular topic before. This has been in use by our ancestors for ~5000 years.

https://en.m.wikipedia.org/wiki/Pot-in-pot_refrigerator

atyh 5mo ago

i love these. the Persians built giant ones.

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Discussion

Ryan 5mo ago

You know it's good tech when it was invented millennia ago and is still in use today.