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TIL That the last Civil War pension was paid in 2020 to the daughter of a soldier who fought for both the Confederacy and Union.

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BgXQW TIL that airplanes in WWI and WWII used Synchronization gear to allow guns to shoot through the propeller without destroying it.
RkG1 TIL that just before Thomas Harrison was hanged and disemboweled he was asked for forgiveness by his executioner. He is quoted as saying “"I do forgive thee with all my heart. The Lord grant that this sin may be not laid to thy charge.” He then gave all of the money he had to his executioner.
QpYd TIL that helium, when cooled to a superfluid, has zero viscosity. It can flow upwards, and create infinite frictionless fountains.
v1oLx TIL about Jim’s Corner. Travelers using the single gravel road in and out of the Northwest Angle are expected to use a telephone at Jim's Corner to contact Canadian or U.S. Customs and make their declarations as the border crossing is unstaffed.
5YVwp TIL before clocks, there were candle clocks that when burned, indicated the passage of periods of time. To set an alarm, you pushed the nail into the desired point and the nail would fall and clank on the metal holder.