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TIL in 1987, FBI agent Robert Hanssen was tasked by his superiors to find a mole within the agency after the FBI's moles in the KGB were caught. In reality, he was the mole, working with the KGB since 1979. He was eventually caught in 2001 and is currently serving 15 consecutive life sentences.

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kJ4J5 TIL the terms "booze" , "fed up", "hoodwinked", "under her thumb" and "wrapped around her finger" come from falconry
p89eZ TIL that the developers of the compact disc (CD) chose its playing time to ensure that Beethoven’s 9th symphony (70 minutes) could be played on a single disc.
xyK0 TIL California’s economy is the 9th largest economy in the world.
P11vJ TIL that the mistletoe plant, a parasite, is the only multicellular organism that does not have a functioning electron transport chain, i.e. it cannot create useful energy for itself
PVDn TIL that during WWII, when Japan occupied China, they built concentration camps that were filled with American, British and other European civilians living in China.