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TIL of the "Elfstedentocht" (eleven city tour). An ice skating tour held on natural ice in the province of Frisia. It visits all 11 historical towns in Frisia and spans almost 200 km. It can only take place when the weather is favorable and has only taken place 15 times since the first one in 1909.

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nW5Mr TIL that the planet's average temperature compared to today was just 6°C (43°F) lower, during the last ice age, and 4°C (39°F) higher, during the age of the dinosaurs. "In climate terms, a change of just a few degrees is a big deal." (Bill Gates, 2021)
vW77 TIL when sliced bread was invented it was described as the best thing since wrapped bread
W4k8 TIL The Crosby, Stills, and Nash song “Just a Song Before I Go” was written on a dare by their limo driver that they couldn’t write a song before getting to the airport. It went on to become one of their biggest hits.
8e8x8 TIL the American Chestnut Tree was king of the Eastern U.S. forests that could grow 120ft (36.5m) tall and 16ft (4.9m) across until a blight arrived in 1904. It took only 40 short years for the disease to bring to extinction the estimated 4 billion ancient giants towering from Georgia to Maine.
ZpZpR TIL there is a super massive black hole named TON 618 which is 140 trillion times more luminous and 66 billion times more massive than the Sun. This is more mass than the entire Milky Way galaxy.