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A comment on Low-Background Steel.

Re:Low-Background Steel by melvyn2 on Saturday July 18, 2020 @11:01PM (#23886681)
https://xkcd.com/2321/
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Re:Low-Background Steel by fuball63 on Saturday July 18, 2020 @11:31PM (#23886782)
That's how I first heard about this concept, which was fairly recently.
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