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A comment on An Ikea Bowl Has Been Setting Things on Fire. Parent comment
https://www.treehugger.com/solar-technology/solar-prototype-...
https://cleantechnica.com/2013/12/23/solar-ball-lens-improve...
Not solid glass, though (I don't know what it is, but I imagine there's an upper limit on size of solid glass spheres that can be made)...
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https://www.treehugger.com/solar-technology/solar-prototype-...
https://cleantechnica.com/2013/12/23/solar-ball-lens-improve...
Not solid glass, though (I don't know what it is, but I imagine there's an upper limit on size of solid glass spheres that can be made)...