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TIL Leonhard Euler wrote 234 letters to 15 year old German Princess Friederike Charlotte over a period of two years in order to teach her math, physics, and sciences. These letters were later reprinted as a textbook for "every female academy in the kingdom"

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a8WEL TIL that Louisiana State Penitentiary ("Angola"), the largest maximum-security prison in the USA, has a radio station, a TV station, a magazine, a fire station, sugarcane fields, market gardens and herds of cattle and horses
dDZKr TIL people have been trying to figure out whether fat collected from dead pigs was used to move the big rocks during the construction of Stonehenge
nW677 TIL filmmaker Spike Lee sued Viacom, claiming that the name of the Spike TV channel exploited his public persona.
VMP9B TIL there’s a mountain in Switzerland called the Niesen (aka the Swiss Pyramid) that’s home to the world’s longest staircase. It’s only open one day a year for a race to the top. The fastest runners can ascend the 11,674 steps and 5400’ (1660m) in just under an hour.
x6Or7 TIL that an increasingly common phenomenon in the modern dating world, ghosting, or a sudden cessation of all contact with someone, is often unilateral but simultaneous ghosting sometimes occurs in which case there is no ghostee.