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TIL Challenger 2 tanks require two sets of tools, as the hull is built using imperial measurements and the turret is built to metric measurements.

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oBZBW TIL NASA had detailed plans to get humans to Mars by as early as 1981, but the mission didn't get enough support from the Nixon administration and was shelved.
oBnVK TIL that Finland was the first nation in the world that implemented universal suffrage (in 1906) and allowed all adult citizens to run for office, regardless of sex or race, and thus was the first true democracy in the world. The following year, the first female MPs in world history were elected.
Wk8Gd TIL just how destructive Bradford Pear trees are. They're considered a highly invasive species (it was once thought they would be sterile as a hybrid). They're incredibly weak and are often damaged in storms, so their life span is usually 15-20 years. They're all around bad trees. Plus they stink!
J1nOV TIL A missing pet tortoise was found in the attic 30 years later, alive and well
epxWL TIL about "Hammerspace," the imaginary dimension from which cartoon characters pull out random objects.