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TIL that that fluting sound some pigeons make when taking off are made by their wing feathers, and serve as an alarm system to other pigeons.

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w6BW TIL Arkham Asylum was named after Arkham, Massachusetts, the fictional town central to many H.P. Lovecraft stories.
ANRPn TIL about Belphegor's prime, 1000000000000066600000000000001, a palindromic prime number with 666 at its heart and 13 zeros on either side. It was named after one of the Princes of Hell, who was charged with helping people make ingenious inventions and discoveries.
7kJp TIL that 95% of nuclear weapons are owned by the USA and Russia
6bnY TIL Babe Ruth wore a cabbage leaf under his cap to keep him cool. He changed it every 2 innings.
x6b97 TIL that Bancroft Hall at the US Naval Academy in Annapolis is the world's largest dorm, housing all 4,400 cadets (midshipmen) in a single building. The dorm has nearly 5 miles of hallways.