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TIL that the mathematician Augustus De Morgan, writing in 1864, noted that he had the distinction of being x years old in the year x-squared.

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JOy1 TIL that in 1980, a Texaco oil rig drilled into the top of a salt mine underneath Lake Peigneur in Louisiana, causing the lake to drain into the sinkhole – swallowing 11 barges – and a nearby canal to reverse direction. All 55 miners in the salt mine escaped. The lake is now permanently saltwater.
GYl7j TIL that the USA does not have an official language at the federal level. English is only the official language of 32 states.
L4P TIL that incidents of domestic violence with families of police officers are 2-4 times more common than in rest of the population.
aOpN TIL the editors of Check It Out! with Dr. Steve Brule pipe their footage through a videocassette recorder, and then hit the machine to simulate jumpy synchronization, to give it that poor quality feel.
PvjV TIL the US government poisoned industrial alcohol during Prohibition, leading to the deaths of around 10,000 people.