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TIL Ancient Roman spies used urine as invisible ink to write secrets between the lines of their official documents, hence the saying: "read between the lines." The messages appeared only when heated.

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9wPKr TIL that not only Danny Trejo and Robert Rodriguez are second cousins, but that they were unaware of their relationship until they started shooting Desperado.
16veO TIL Lottery Winners and Paralyzed Accident Victims stabilized to similar levels of happiness in a 2004 study analyzing adaptation theory
OoNxe TIL that, when Sierra Leone's 11-year civil war ended following intervention from the British military, the grateful public left graffiti in the streets of the capital that said, among other things, "Queen Elizabeth for king!"
nWJM7 TIL that the Chicxulub asteroid sent pieces of Earth as far as Jupiter’s moons.
KOerw TIL that in 1921, Evan O'Neill Kane was the first doctor to remove his own appendix to test if local anesthetic would be sufficient pain killer for patients.