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TIL that the Great Pyramids of Giza were built smooth and shiny. There was an outer layer of white limestone that covered the pyramids and reflected the Egyptian sun, but it was removed over time and only the inner layers remain.

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ANOYl TIL: The descendants of Genghis Khan (1162 — 25 August 1227) continued to rule parts of Central Asia for 700 years until the 1920s, when they were conquered by the Bolsheviks and their states became part of the Soviet Union.
wEmW TIL that Carrie Fisher was addicted to Cocaine during the filming of Star Wars: The Empire Strikes Back, and also survived an overdose
l7NQ7 TIL John Galt, the (anti)hero of Atlas Shrugged, shares his name with a British novelist who was first among authors to discuss the effects of the Industrial Revolution. He was also an early leader of the Canada Company meant to represent the Empire's interests, but he fell into disgrace from debt.
DQn4v TIL by simply paying off the Mexican Navy, bucheros, or the local illegal fisherman, have reduced the smallest dolphin in the world, vaquita marina, to a number of 8. Many believe the animal is just a myth.
yVlya TIL that 1 million seconds equals about 12 days, while 1 billion seconds equals almost 32 years. Likewise, a million dollars in $100 bills weighs around 22 lbs, while a billion in $100 bills weighs about 22 tons.