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Ok I just read a bit more and apparently there are some fringe geophysicists who think it really is more like a reactor. I didn't know that.

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There were actual "natural" fission reactors in the crust in central Africa some time ago[1] .. the broader region provided the bulk of the ore for the Cold War production of weapons grade ore.

[1] https://en.wikipedia.org/wiki/Oklo_Mine

Nature used up the best ore billions of years ago. We did get radiation-resistant microbes in exchange.

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