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TIL that Paul McCartney, George Harrison and Ringo Starr have all made separate special guest voice appearances, as themselves, in episodes of The Simpsons. Of the "Fab Four", the only Beatle to never make an appearance is John Lennon, who was murdered in 1980, nine years before the show started.

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epyV4 TIL that "Killing baby Hitler" is an ethical and theoretical physics experiment. It explores the idea of time-traveling to assassinate infant Adolf Hitler, delving into ethical consequences and temporal paradoxes.
pna8 TIL there is a sea-slug that eats the venomous Portuguese Man o’ War, can store the creature’s poison for its own use and swims upside down
Aplo TIL, The British National Grid have to prepare for power surges due to so many people switching on kettles during advertisement breaks of popular shows.
d8gx9 TIL that traditional haiku poems must contain both a kireji ("cutting word") and a kigo (seasonal reference)
yVGOJ TIL in 1836, when Nikolai Gogol presented his play The Government Inspector, focusing on a corrupt mayor tries to cover up his own corruption and bribe a visitor he mistakes as an inspector, the tsar personally overruled the censors and had it staged as a warning to officials.