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TIL that while a Canadian Mafia boss was incarcerated his father,son,brother in law and close associate were all murdered. Upon his release he orchestrated the deaths of 11 people in retaliation and evaded both injury and re incarceration before dying of cancer.

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GA1Wj TIL that there is a continuous line of doctoral advisor-advisee relationships going back from the present to the 1200s to a scholar named Kamāl al-Dīn Ibn Yūnus. He has more than 190,000 known academic "descendants", including Leonardo da Vinci and mathematicians Fourier, Lagrange, and Hilbert.
5VQEP TIL that Fort Douaumont, the largest and most important fort in the French defense system during World War I, fell to a force of 98 Germans in 3 days in February 1916. It took the French army 302 days, and an estimated 337,000 casualties to retake it.
DQnYJ TIL the shortest commercial flight in the world is between the Scottish islands of Westray and Papa Westray, which takes only 1.5 minutes from takeoff to landing.
p8OMp TIL - the early model pay phones had three slots, one for nickels, dimes and quarters. Each slot would play a different sounding bell, letting the operator on the line calculate how much money was deposited
6EJ08 TIL that the Klaxon horn (the very loud "aaaaYOOOGAH" horn found on old cars and Navy ships) was invented by the same guy who invented one of the first electric hearing aids.