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TIL Queen Elizabeth served as a truck mechanic in WW2

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5eeQ TIL Among other things, the Presidential state car features a blood bank of the Presidents blood type in the trunk.
9K56 TIL that the airspeed velocity of an unladen swallow is 25 mph or 40 km/h.
v1gRK TIL that Emily Davison, a brutish suffragette, stepped in front of the King’s horse at the 1913 Epson Derby and was killed. This shows that protestors have always stood in high traffic areas. There’s a video of it too. Emily Davison | British activist
PYEyE TIL That in 1973 IBM offered its UPC bar code proposal to the grocery industry for free. The industry accepted a very close standard to their proposal. However, IBM also made the first technology capable of reading the bar codes, and made tons of money selling the equipment to grocery stores.
9nRB TIL the Tiananmen Square tank man during 1989 was not actual stopping the tanks to go attack the protesters, the tanks were actually going back to their barracks because the massacre happened the day before.