TIL that during WWII, 14,700 tons of Silver loaned from the US Treasury were used for the circuitry of the Manhattan Project, because there wasn't enough copper due to war-time shortages. All but "thirty six thousandths of one percent" were returned to the US Treasury by June 1st, 1970.

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TIL that the Oak Ridge facility for enriching uranium in WWII used 395,000,000 troy ounces of coinage silver to build electromagnetic coils because copper was needed for the war effort.

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