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TIL in 1963, the US Military created an artificial ring around the Earth, in order to serve as a man-made ionosphere. The ring was made of copper needles and was used for worldwide communications in the case that the Soviets disabled all other methods of communication.

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PYbPV TIL "Japan was changed forever by the devastating triple tragedy that unfolded on March 11, 2011, bringing an earthquake, tsunami and nuclear crisis." "The total cost of the catastrophe has been put at $286 billion by the World Bank, making it the most expensive disaster of all time."
P1WEV TIL 7-UP was launched 2 weeks before the 1929 stock market crash and contained lithium until 1948.
JY498 TIL about the 'Nobody For President' campaign from 1976. It was popularized by activists such as Wavy Gravy. The appeal for Nobody was apparent: Nobody was the best candidate. Nobody cares about you. Nobody loves the poor. Nobody will end the war. Nobody will cut your taxes.
ZpkmB TIL a 2024 study found that on average a single cigarette takes about 20 minutes off a person’s life. This figure nearly doubles an estimate from a 2000 study of roughly 11 minutes per cigarette and means that a typical pack of 20 cigarettes can shorten a person’s life by nearly 7 hours.
ne4RG TIL of the Memorial Chamber in Canada’s Peace Tower. The name of every Canadian soldier killed is inscribed in one of several books on display. Each day, at precisely 11am, the pages are turned so that every name is visible at least once per year.