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TIL in 1947 Bing Crosby had to record a new version of "(I'm Dreaming of a) White Christmas" because the original master version of 1942 wore out, due to being constantly repressed to meet demand. This version soon replaced the original and became the standard we usually hear on the radio today.

Y7yWP TIL Despite the historical nomenclature, the "imaginary" part of complex numbers have a mathematical existence as firm as that of the real numbers, and they are fundamental tools in the scientific description of the natural world.
lowJA TIL that upon the archaeological discovery of Chechen-Soviet soldiers from WW2 in Ukraine, archaeologists discovered letters addressed to relatives in Chechen towns which no longer exist. Further investigation revealed the Khaibakh massacre perpetrated by Soviet forces.
kJdY1 TIL that antisemitic violence continued in Poland after WW2, with the Kielce Pogrom taking place on July 4th 1946, and resulting in 42 Jews being killed and 40 wounded
WZNN TIL: Three soviet engineers volunteered their lives at Chernobyl to release water from the broken reactor. Had they not done this, the resulting fallout would have covered most of Europe. All three men died within two weeks.
QJ4aL TIL that the official divorce complaint of Mary Louise Bell, wife of world-famous physicist Richard Feynman, was that "He begins working calculus problems in his head as soon as he awakens. He did calculus while driving in his car, while sitting in the living room, and while lying in bed at night."