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TIL Canada adopted its current Maple Leaf flag in 1965, because Egypt objected to Canadian peacekeepers wearing the Red Ensign (it included the British Union Jack), as Britain was a belligerent party since the 1956 Suez Canal Crisis.

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0wQvM TIL that the superstitious tradition of knocking on wood for good luck is believed to have been conceived by ancient Indo-European people who believed that spirits (both good and bad) lived within the trees. By knocking on a tree one was asking for a blessing from the spirit which lived within.
16nRW TIL the Prinz Adalbert a German Naval ship during WW1 was torpedoed by a British submarine, it exploded and sank immediately with the loss of 672 crew. There were only three survivors.
0KwL TIL that if whatever dish you’re microwaving gets hotter than the food/drink you’re microwaving, it is not microwave safe.
4XpnJ TIL that human laughter evolved from the distinctive panting by our great-ape relatives during rough and tumble play; that panting functions as a signal that the play is all in good fun and not an attack.
5YyPr TIL Kelsey Grammer based Sideshow Bob's voice on actor Ellis Rabb, who he briefly worked for hanging wallpaper