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TIL about Lepersonnite, an extremely rare rare earth mineral only found in Shinkolobwe deposit in the Democratic Republic of the Congo. It is the only mineral in which the chemical element Gadolinium, otherwise too reactive to exist, is found in nature. 400 tonnes of Gadolinium are produced yearly.

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VMD4G TIL That, while it is the most common position for nearly all animals, no one is quite sure why the sex position became referred to as "doggy style". In Latin it was known as "sexual intercourse in the manner of wild beasts" and in the Kama Sutra it is called "the cow position".
d8N5E TIL Granulation on the sun is visible only in excellent seeing with high power and at least a 4-inch aperture filtered telescope. Sometimes called rice grain or lemon peel, this textured appearance is due to hot gas continually boiling up to the Sun’s surface, cooling, and sinking down again
e0jdg TIL why the term "Paradigm shift" came to be. Initially coined by Thomas Kuhn as "Paradigm change" Kuhn realized there were certain discoveries(revolutions) that so fundamentally changed the way we saw the world.
j6VZQ TIL that before the Gregorian calendar went into effect in 1582, leap years were created differently. Instead of adding an extra, separate day to the end of the month (February 29th), they doubled February 24th during leap years, resulting in two consecutive days with the same date.
v1kkL TIL: Most musicians of the eastern European dance/hip-hop/rock/pop band "Carla's Dreams," even while getting songs onto (Euro-) top airplay charts, have managed to keep their identities secret for almost a decade. They perform while wearing masks.