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Today I learned that the original eraser was stale bread and erasers are pink because of pumice: Guide to Erasers

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nebRW TIL in 1990 the West German government received a message from the Soviet general Geli Batenin, offering to return Kaliningrad. The offer was never seriously considered by the Bonn government, who saw reunification with the East as its priority.
BE4D TIL there is a psychological disorder caused by disappointment from visiting Paris.
xB6D TIL Pablo Picasso would always pay for things with a personal check. He realized his signature was worth so much that they would rarely cash the check.
0weQN TIL Arnold Reuben, the man who invented the Reuben sandwich, is also the inventor of the New York style cheesecake.
x69JB TIL - (on my medicine board review exam) Evidenced-based research found that Tai Chai has beneficial outcomes on patients with KNEE osteoarthritis.