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TIL that during the Cold War, a technique called "Zersetzung" (German for "decomposition") was employed to undermine stability of dissidents, and included things like moving furniture and rearranging personal items in people's homes or offices to make them question their memory and sanity

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w4GP TIL that mafia capo Gregory Scarpa was recruited by the FBI to help find the bodies of three civil rights workers. Scarpa got the locations of the bodies after he kidnapped a Klansman, pistol-whipped him and stuck a gun in his mouth
dDYor TIL the Atlantic Pygmy Octopus drills a hole into crustacean shells in order to inject them with paralyzing venom
vPjVr TIL metal tube invented in 1732 is what measures the speed of supersonic jets (and any other airplane, boat, or even F1 car). Called a pitot tube, it measures airspeed by measuring air pressure. More information at the link.
b69Bp TIL in 1944, countries agreed with the US to settle their international accounts in dollars to have gold converted at a fixed rate of $35 per ounce. In 1971, President Nixon announced the US would no longer do it, thus completely abandoning the gold standard. This was known as the 'Nixon Shock'.
9E1G TIL if the space between the Earth and the Sun were filled with air, the Sun would be louder than a train horn. We, on Earth, would constantly hear it at 125 decibels – for comparison, a train horn 1 meter away comes in at 120 decibels.