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TIL the BORAX (Boiling Reactor Experiment) tests in the 1950s and 60s involved creating experimental reactors to test the viability of boiling water reactor designs. The final test involved ejecting the control rods with springs to cause the reactor to explode via prompt criticality.

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Eg6k0 TIL: The defunct bank Wachovia laundered $378.4 billion between 2004 - 2007 for the Mexican and Colombia Cartels. They had to forfeit $110mil and were only fined $50mil.
ANKnn TIL there is a written form of American Sign Language (and other sign languages) called Gloss.
69dWJ TIL "The Most Mysterious Song on the Internet" is a song known as "Like the Wind" recorded from a radio broadcast in West Germany in the early 1980s. Despite extensive searching, the band behind the song remains completely unidentified.
kOLWB TIL that the earliest-living historical person known by name is Iry-Hor, a predynastic pharaoh who ruled over Upper Egypt in around 3200 BC. His dynasty is regarded in Egyptology as 'Dynasty 0' - the first out of 30 dynasties that reigned over Egypt.
ADAeo TIL there is only one person registered as a "Rectal Teaching Assistant" in the UK, traveling the country offering his anus to be examined by trainee doctors. He has since lost his job to a robot anus.