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When the water evaporates, it pulls the heat out with it, making the inside cold. It's a natural, cheap, easy-to-make refrigerator.


Its a great idea. But it does have some problems. One, it doesn't work in humid climates. Hence the old wives saying about thundery weather making milk go sour. And it requires a fair amount of water, which isn't available in a lot of places that aren't humid.
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A gentleman should always be able to break his fast in the manner of a gentleman where so ever he may find himself.--Good Omens