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inglor_cz
on July 15, 2023
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Could an industrial civilization have predated hum...
Not all metal. Buried gold retrieved from ancient graves looks very "fresh".
MichaelZuo
on July 16, 2023
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After ten million years even a large gold ingot would entirely be subsumed by the surrounding matter. Assuming a 10 nanometer/year erosion.
jiggawatts
on July 15, 2023
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Also most of the noble metals would remain pristine: platinum, iridium, etc…
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