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TIL that Fahrenheit and Celsius meet at -40°F (-40°C)

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wo6mW TIL in 1854, Dr. Jules Baillarger depicted a mental illness expressed by switches between mania and depression. He named it dual-form insanity. Dr. Jean Falret described the same illness but named it circular insanity. They spent their lives disputing who first conceptualized it.
e0apg TIL Red Solo Cups are popular souvenirs for people visiting America
W76m4 TIL South America is the only inhabited continent in the world without monarchies. All South American countries are presidential republics except Suriname (a parliamentary republic) and French Guiana (a French overseas department).
W7VVL TIL in 1969, Paul McCartney’s head went missing from a Los Angeles billboard promoting the Beatles album “Abbey Road”. The mystery remained unsolved until 2012, when a man named Robert Quinn confessed that he stole it as a prank on his 19th birthday and still has McCartney’s head in his living room.
1bgO TIL of a homing pigeon called Cher Ami that saved close to 200 lives during WW1 by delivering a message. The pigeon was shot through the breast, blinded in one eye and had its leg hanging only by a tendon upon arriving with the message.