I've done a lot of reading on what is called thermogenesis. It is basically the idea that our bodies work best and get stronger under stressful temperatures or situations. It's 100% true, just like when you work out you get stronger. But you can't over-do it or it's bad for your body. I've heard cold showers change people's lives for the better. I can see it as domestication was really when warm water started becoming universally available.
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