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TIL that while working as a HS teacher, Rey Johnson invented the automated test scoring and sold it to IBM. The company hired him and he went on to lead the team that invented the Hard Disk Drive

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kJd8e TIL that in addition to being an award-winning comedic actress know for her various film and television roles, Julia Louis-Dreyfus is the daughter of French billionaire businessman Gérard Louis-Dreyfus.
7rXpb TIL that Queen Elizabeth II and her husband, the Duke of Edinburgh are both descendants of Queen Victoria. This would make them 3rd cousins.
k5kB TIL 1992 an officer in the Soviet KGB defected to the west brining with him thousands of notes he took during his career in the KGB archives. These notes reveal the KGB’s hand in framing the US government for the Kennedy assassination, spreading the rumor that AIDs was a US invention, and much more.
wLrJ7 TIL that there was a Muslim slave revolt in Salvador during Ramadan in 1835
a97A TIL spiral staircases in medieval times wound in a clockwise direction (from the ascender’s point of view) to place attacking swordsmen (who were most often right-handed) at a disadvantage