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TIL that during the German Invasion of Poland, 720 Poles defended their position against over 40.000 attacking Germans, stopping their advance for three days

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VM56Q TIL Tree experts pointed out a mistake in current Canadian currency. Instead of it's notes featuring Canadian maple leaves, it instead features Norwegian maple leaves. Although, both look fairly similar.
J1mK1 TIL, while investigating the behavior of web hyperlinks that you drag and drop onto textboxes, that water treatment plants have re-carbonization and sludge lagoons. Also, I'm not sure that all of this should even be public, considering the ramifications when these things are compromised. ISMO.
dDYB8 TIL SpongeBob SquarePants was originally going to be called SpongeBoy Ahoy!. However, the name had to be changed because SpongeBoy was already trademarked. Creator Stephen Hillenburg chose SquarePants to emphasize the character's distinct shape and goofy personality.
ADApa TIL "Hocus Pocus" was released in July 1993 instead of October due to Disney not wanting it to compete against their other Halloween-themed film, "The Nightmare Before Christmas", which was due for release in October by Touchstone Pictures.
wrrM TIL of Louis Slotin, a scientist who died while working on the Manhattan Project. He accidentally dropped a hemisphere of beryllium on a plutonium core; witnesses saw glowing blue light and felt a heat wave. He died nine days later. The plutonium core was later nicknamed the “demon core”.