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TIL of the cesium test. To test if an old bottle of wine is genuine it is tested for cesium 137. If there is none present, the bottle predates 1945 and the nuclear age.

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5YGKB TIL Ivy league schools all had ties to the Opium trade in the late 19th century with major benefactors using their drug money to fund libraries, societies and even Princeton itself. Undergrads even began running opium dens from Boston to New York until a Harvard student OD'd in 1889.
KOPW9 TIL An electric scooter firm in Mexico City temporarily ceased operations in 2019 because so many of its two-wheeled units have been stolen. The company said in a statement that "at present, the theft of our scooters in Mexico City is the biggest challenge."
kOjQe TIL Robin Williams improvised 16 hours of material for the Genie. The Animators adjusted the animations to his voice-performance.
WkOxY TIL a Senior Judge of the US Court of Appeals was involved in running Operation Match, the first US computer dating service, after he dropped out from Cornell University due to "boredom".
xVM1B TIL China has a history of using underage athletes in Gymnastics in the Olympics