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TIL: In a room at Microsoft's headquarters in Redmond all sound from the outside world is locked out. It's called an "anechoic" chamber, because it creates no echo at all. The background noise is so low that it approaches the lowest threshold theorized by mathematicians - next step is vacuum.

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QJOKM TIL “cataphiles” come from all over the world to illegally explore at least 180 miles of “catacombs” — abandoned mines — under Paris. Artists paint murals. Fire dancers perform. Nazi bunkers and French resistance hideouts sit side by side. Graffiti from the French Revolution marks the walls.
eobL TIL Peter Cetara forgot his own name when he first met Paul McCartney. He said to himself “I’m just gonna go up to him and tell him how much I like his music.” And he walked up to him and said “Hi Paul, my name is …” Fortunately McCartney replied “I know, you’re Peter Cetera, how are you mate?”
xVnxb TIL of Botrytized Wines, known for their sweetness. They gain the character from being made from moldy grapes infected by a specific fungus. The rotten skin increase water evaporation and highetens the sugar concentration.
EgY1o TIL victims of the Jonestown massacre did not actually drink Kool-Aid. They drank Flavor Aid which was a competing brand at the time.
l7RMN TIL Space Shuttle Columbia and Enterprise were initially fitted with ejection seats borrowed from the SR71