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TIL only 8% of the world’s currency is physical money, the rest only exists on computers.

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4XodX TIL that pipelines are internally maintained via "PIGS" (Pipeline Inspection Gauges), which perform cleaning, inspection and other maintenance operations. The PIG is inserted via a "pig launcher" and removed via a "pig catcher."
KY6nE TIL that during a meeting between Grover Cleveland and James Roosevelt, Cleveland said to Roosevelt's accompanying son, Franklin, “My little man, I am making a strange wish for you; that you may never be president of the United States.” The young Franklin Roosevelt became President 45 years later.
Wk4LA TIL late medieval and early modern European cartographers believed that compasses consistently pointed North because there was a massive, perfectly circular island made of naturally-magnetic black rock at the North Pole.
mxWbp TIL of Ski Valley at Sangre de Cristo in New Mexico, which has "Tree Martinis" to calm the nerves of the skiers heading down the mountain.
mxaPE TIL the character of Oliver in novel and movie Love Story, is partly based on Tommy Lee Jones who author Erich Segal met at Harvard. Jones plays one of Oliver's roommates in the 1970 film