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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.

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oB14Y TIL barns were originally a red color because of the linseed oil and rust farmers used to paint them - this mixture dried quickly and prevented things like fungi, moss and mold from growing, as well as providing a long-lasting coating. Barns today are still painted red in honor of this tradition.
nyvd TIL Bruce Willis dropped out of the Expendables 3 because he wanted 4 million dollars instead of 3 million, for four days of work.
Od5g TIL the 2002 Scooby-Doo film was originally PG-13, with full acknowledgement of Shaggy being a stoner, and Velma and Dephne kissing
rNnnw TIL about the only surviving male defender of the Alamo, a slave of Col. William Travis named Joe.
XwGX TIL the collective term for ferretts is a business.