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This is much more elegant than the spinning trick, as it doesn't require energy input.

Works really well in deserts, if you keep the sock in the shade.

I wonder if you wound up the sock and let it spin if you'd get something virtually equivalent to this machine.

I think you need to experiment.

Evaporative beer cooling.. very clever. I wonder if there is a market for a product dedicated/optimized for this (incorporated drawstring/hanger, ideal material, etc.)

"Billy Mays here for Beer Sock!"