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You could just look for isotopes from the atmospheric nuclear tests that were conducted? Doesn't need to be a reactor I would assume?


Indeed. That's one of the reasons why the "Before Present" time scale (that uses 1/1/1950 as the epoch) is sometimes called "Before Physics" (another one being that 1950 is less and less "present", of course)!


> that uses 1/1/1950 as the epoch

I guess we can say this is when humankind reached adulthood, became able to drink and got a driver’s license. And a gun.


Yes.

But also, finding something from within the last hundred years doesn’t say an awful lot about something claimed to have been a closed system for millions of years.




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