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TIL A secret message was engraved inside Abraham Lincoln's pocket watch by a jeweler, and it was not discovered until 2009.

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QNb4d TIL that in the 1930s, a man named Martin Couney saved the lives of thousands of premature babies by hosting them at a carnival
gJKL TIL of the cesium test. To test if an old bottle of wine is genuine it is tested for cesium 137. If there is none present, the bottle predates 1945 and the nuclear age.
16kjP TIL that some helicopters have various parts that are intentionally designed asymmetrically, to compensate for the tail rotor pushing the helicopter sideways when it’s hovering. They also have asymmetrical landing gear for the rotor to remain level when landed
8eAmV TIL About Billy Mitchell who pushed for air power between WWs 1 and 2. He proved air superiority by bombing captured german warships after WW1 using bombers. For his efforts he was court marshaled and resigned from the military. After his death, he was given a Congressional Medal of Honor
loLBr TIL The "International Space Station" (ISS) was built/assembled piece by piece (modules) rather than building it first on Earth and launching it in one go, due to it's sheer size