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TIL there is a constant in physics that is dimensionless and unitless, connects electromagnetics to general relativity to quantum mechanics, and there is no theoretical foundation for its existence - it just shows up in measurements.

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nWJM9 TIL the black hole, TON 618, is so big (66 billion solar masses), a new term was invented to describe it: ultramassive black hole
8ONX TIL that in 1787 a large shark was caught in the Thames river, and when the contents of its stomach was examined it included a watch, silver chain and seal that had belong to a British sailor who had been lost at sea, but was originally from Shoreditch.
xVGg0 TIL the martial arts style portrayed by Denzel Washington in the 2010 movie "The Book of Eli" is called Kali and is the national martial arts form of the Philippines. It teaches to focus on and react to angles of attack rather than particular strikes/attacks.
R5ge4 TIL about an invented language from the 1800s called Esperanto. Its goal was to become a "world language" and the founder LL Zamenhof constructed it to be very easy to learn. It can be found on Duolingo and is the world's most widely spoken constructed international auxiliary language.
OAWe TIL Humans are capable of using the same principles of echolocation that bats, dolphins, and whales use to navigate their surrounds; One of the better-known demonstrators of this phenomenon is Daniel Kish, a man who can ride a bicycle and hike in the wilderness despite having no eyes at all