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Well, or even more effective, just put your clothing into water. I even have a vest that is specifically designed for that:
You’ll put it into water and evaporation is keeping you cool with a relatively stable temperature. For example: I sat around a few people who were clearly not “enjoying” the heat, while I was quite comfortable (and I’m really sensitive to heat and would normally escape hot places instantly).
Problem is still the the whole population gets older on average (due to low fertility rate)…