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TIL that there is a Singles' Day. It's a Chinese holiday celebrated on November 11th. They chose the date 11/11, because the numeral 1 resembles a bare stick, which is Chinese Internet slang for an unmarried man

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RDm1 TIL 34 years ago, Carl Sagan stated that the total energy picked up by all the radio telescopes on the entire planet in all of history is less than the energy of “a single snowflake hitting the ground”. The count is now around 2 snowflakes.
Lkaap TIL that the oldest Olympian ever was Oscar Swahn of Sweden, who won the gold medal in shooting at the 1912 Olympics at the age of 65.
GYQmE TIL that a place exists called "The Gateway to Hell" in Ethiopia, one of the hottest and most alien places on the planet. The air is toxic to humans and organisms were found living in pure acid without any oxygen.
E1BGx TIL of the Swansea Devil. In the 1890's, two architects wanted the contract to rebuild a church. The loser later placed a carving across the street and prophesied, "My devil will see St Mary’s burnt to the ground". Swansea was heavily bombed in WWII, including the church, but the devil remained.
b6LX7 TIL that 2025 = (20 + 25)^2 = 45^2 which is neat, as 25 is also a square number.