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TIL that Andrew Jackson was the only president to pay off the national debt, but a depression from 1837 to 1844 caused the national debt to increase and it has not been paid in full since.

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BrbAD TIL At 65 Stephen Hawking fulfilled his dream and did a backflip in zero gravity
pYnwb TIL about Peter Brough, a British ventriloquist with a hugely popular 1940s and 50s radio show. His radio success prompted a move to TV in 1956, which killed his career when his fans realised you could see his lips moving. A later critic wrote "Ventriloquism on the radio - I could have done that."
LQN6r TIL A Canadian Institute of Technology installed sleep pods in its campus library so students can lie down for a proper sleep if they should need it. However staff sit about 15 feet away and nappers are under video surveillance to prevent more than solo sleepers
6Eapw TIL in the 1950s, a researcher was designing army airplane seats for an 'average' pilot based on measurements from 1000s of airmen, only to discover this theoretical 'average' he'd derived wouldn't fit any of them. This realization led to adjustable seats, foot pedals, helmet straps and flight suits
9YoWp TIL Finland has the best education system in the world. The focus is on hiring the best teachers who must have a master's degree and all schools are funded through the government thus private schools are rare.