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TIL that in 1942, Manhattan Project needed 5000 tons of copper, which was in short supply; to avoid delays, it borrowed 430 million troy ounces of silver from US Treasury to be used in magnets. The silver was fully returned by 1970 as the equipment was decommisioned.

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OGaY4 TIL Stallone is the only actor in the history of American cinema to have starred in a box-office number-one film across six consecutive decades
aL6M TIL there was a terrorist organization in the late 1940s in Brazil, made up of Japanese immigrants that believed Japan had won WWII. They urged Japanese Brazilians who did not believe them to commit seppuku, and executed those who didn’t.
MVmV TIL the only person a 5-star U.S. general will salute first (other than the president) is a Medal of Honor recipient.
edKL TIL The space shuttle Challenger explosion did not immediately kill the crew. The undamaged crew compartment broke free and continued to gain altitude to a peak of 65,000 feet before beginning a 2 minute 45 second free-fall into the Atlantic ocean.
ADeZo TIL historians have partnered with a retirement home to find those still able to read the civil-war era cursive script of the Seward family.