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TIL Sarah Childress Polk got married at 21, became First Lady at 41, and after James K Polk died 103 days after leaving office, lived another 42 years, the longest widowhood of any First Lady.

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VMXPB TIL of the Servicemembers’ Civil Relief Act. While in active duty military, you can submit a request to your credit card lenders to lower your interest rate to a maximum of 6%, and they are required by law to comply. This applies to debt incurred before joining as well.
WkmeN TIL about Project GUNMAN, the discovery of primitive keylogging technology installed by the KGB into the IBM Selectric typewriters used in the US Embassy in Moscow, enabling the Soviets to steal US secrets for eight years.
R7jy9 TIL about the Fold And Cut Theorem which states that any shape with straight edges can be cut from a single sheet of paper with a single straightforward cut, with the right folding.
W71pN TIL that Bill Lancaster, son of famous actor Burt Lancaster, wrote the screenplays for The Bad News Bears (1976) and John Carpenter's The Thing (1982).
KOBb9 TIL Products made in Japan were ridiculed and thought to be low quality until 1950 when The New York Times reported the excellence of Nikon cameras during the Korean war with the headline "Japanese camera"