Something a bit more techie: I spent a couple hours last night learning about Stirling engines. This because it occured to me, can't we generate electricity using steam produced by solar power? And, of course, we can. I found this item, which involves superheating salt (too complex and too dangerous - I want something more household). What helped me most was a set of videos from greenpowerscience.com, which showed me first a setup with mirrors, and then, ultimately, the Stirling engine, which I studied in more detail on (where else?) Wikipedia.
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