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TIL Brooklyn's Cobble Hill Tunnel is the oldest subway tunnel in the world. It was closed in 1861 and forgotten for over 100 years. In 1980 it was rediscovered by a local college dropout named Bob Diamond.

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GYLO5 TIL there are 6 different types of belly buttons and they aren’t the result of the way a doctor cuts the umbilical cord.
5g4r TIL that Bagpipes, haggis, kilts, whisky and tartan all originate from outside of Scotland
rR7Jx Today I learned about Ossip Bernstein, a famous chess master who escaped the firing squad by winning a game of chess.
Mexdm TIL about Kryptos. A sculpture of 4 encrypted messages by artist Jim Sanborn at the CIA Langley grounds. The first 3 parts have been solved but the 4th remains a mystery despite continued worldwide efforts to decode it.
0w8N5 TIL National Geographic hires an archivist who has worked by himself in the magazine office basement for over 30 years. He has handled hundreds of thousands of photographs and is responsible for about eight million images in the vintage collection