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Hardware ideas
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An open source method for making the evacuated tubes used in really powerful solar cookers. I have no idea what kind of arcane technology is used to make those things, but barely anyone sells them and they're expensive and fragile. I'm kind of picturing that you could assemble one by using a large vacuum chamber that doubles as a glove box? That apparently is a thing that exists, according to wiki.
Haha, this unfortunately falls way out of my area of expertise :)