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TIL the concept of sister cities originated in WW2 as a way of establishing solidarity between allied cities that had been devastated by fighting and air raids. The first 'twinned' cities were Coventry, England and Stalingrad in the Soviet Union in 1942 as both were extensively destroyed in the war

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x6ayg TIL: that the tallest mountain in the solar system is Olympus Mons on Mars, which stands at a height of 22 kilometers (14 miles). Almost three times the height of Mount Everest!
xMe1 TIL that most deaths from an overdose occur when an addict who has gone clean relapses and administers their old dose without realising that they have lost the tolerance they had built up.
JYjaV TIL that on October 24, 1975 an estimated 90 percent of women of Iceland participated a “women’s day off” to demonstrate the value of their work, both paid and unpaid. Fathers had little choice but to bring their children to work or stay home themselves, leading them to call it “the long Friday.”
oBvbW TIL as a child Jimi Hendrix, being left-handed, would secretly restring his guitars to fit his left hand, but when his superstitious father was around (who believed it was bad luck to play with your left hand), he taught himself to play the normal guitar upside down.
Bvbr TIL in 1908, Lieutenant Thomas O. Selfridge did a test flight with Orville Wright in one of his planes to see if the US Army would be interested in buying the plane and its design. Orville crashed the plane and the lieutenant died. The US Army purchased the plane anyway.