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TIL that there is no closed formula that can be used to exactly find perimeter of a Ellipse like a circle or square. We can only approximate it values.

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wrAY TIL the actor who played Lord Farquaad in Shrek the Musical was 6’ 2". He played the entire role on his knees, earning him his second Tony.
4XBeo TIL that Soviet music bootleggers in the 50s and 60s would take discarded X-Ray film from hospitals and re-purpose them into improvised phonograph records containing banned music. These recordings were called "Rib Music", "Jazz on Bones", or "Roentgenizdat"
VMyWQ TIL the creator of the Rainforest Cafe chain first tested out the concept in his house. He decorated it with 45 birds, 9 fish tanks, and many plants. He even set up fake thunderstorms. His neighbors thought he was crazy.
eZGD TIL that Alfred Binet, original inventor of the IQ test, created the methodology to identify students who needed help, and deplored its use as a ranking for a unitary and linear intelligence.
D96p TIL the Iran–Iraq War (1980–1988) saw the only confirmed air-to-air helicopter battles in history.