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TIL During the invasion crisis of 1940-1941, the British tried making up for a shortage of armored vehicles with the "Bison", a truck with a concrete cover to act as armor. They were mainly used as mobile pillboxes to protect airfields from paratroopers.

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4XVOJ TIL more than 30 countries sell citizenship or residence permits for cash. In Thailand, the cost is $10,000, while fast-track residence in the UK requires $10m.
Y77LA TIL the term used by scientists to describe "falling" into a black hole: spaghettification.
7NB7 TIL that one of the only senators ever assassinated was Leo Ryan who was killed by Jim Jones’s cult members while they were in the process of committing mass suicide. He had come to investigate reports from concerned family members.
9L9r TIL of the Rosenhan Experiment, a study that showed that many doctors in psychiatric hospitals cannot actually distinguish people with actual mental illness from those faking it.
R1WQ TIL that Memorial Day was a practice originated by the Confederate South