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TIL that the Schwarzschild Radius is the size an object is compressed in order to make it a black hole. Earth’s Schwarzschild Radius would be compressing it to 8.7 mm, which is roughly the size of a peanut.

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yQZvJ TIL the production of Apocalypse Now had actual dead bodies on set, from someone who supplied bodies to medical schools for autopsies. It turned out he was a grave robber.
WkpXA TIL that NASA ground controllers were once shocked to hear a female voice from the space station, apparently interacting with them, which had an all-male crew. They had been pranked by an astronaut who used a recording of his wife.
W77MA TIL 94 US WWII Servicemen executed by the US Military are buried in "Plot E" of the Oise Aisne American Cemetery in France, a section designated for “the dishonored dead". Hedges hide it from view, no US flag is permitted to fly over it, the graves lack headstones and it is not publicly accessible.
x6LVk TIL in the '40s theatrical producer John Reber promoted a plan to build two dams to change most of San Francisco Bay into two freshwater lakes. He got a lot of support, but the US Army Corps of Engineers built a giant working model of the bay to show how this plan was a terrible idea
pYZDO TIL About a power plant turbine bearing at Holtwood Hydroelectric Power Plant that has been operating maintenance free for over 100 years and rated by the ASME (American Society of Mechanical Engineers) to continue operating for another 1300 years without maintenance.