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TIL in 1943, an Oklahoman courthouse was mistakenly bombed by the US Air Force during a training mission. For many years, the city was thought to be the only U.S city bombed by its own military.

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J16rm TIL the Death Camas plant is so toxic that there is only one known pollinator. The plant is visited by a specialist mining bee, which can tolerate its toxins - others are fatally poisoned. One plant species name is Toxicoscordion venenosum var. venenosum ≈ toxic bulb poisonous poisonous.
p8Eje TIL that a violent Japanese leftist group, the United Red Army, invaded a ski lodge and took the housekeeper hostage, resulting in a bloody ten-day standoff with the police and the first-ever live 24-hour news coverage in Japan
e0YLE TIL about "Folie à deux" aka Shared Delusional Disorder, which is a mental disorder where a delusional inducer influences secondary individuals into believing the delusion. It occurs most commonly between two people, but can occur between many people ("folie à plusieurs").
OGBne TIL that there is no specific date for when the office of prime minister of the UK first appeared, as the role was not created but rather evolved over a period of time through a merger of duties.
QNWPM TIL the Great Arkansas Pearl Rush started in 1897 after a 14-grain pink pearl was found in the Black River near Black Rock, Arkansas. It lasted until 1905, but a button-making industry emerged that continued on to the 1940s by using mussel shells that had been discarded.