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TIL that brushing your teeth at a 45 degree angle, also known as the Bass Technique or the Modified Bass Technique, is superior at removing supragingival plaque (i.e. above the gumline) compared to normal toothbrushing.

Read more ncbi.nlm.nih.gov

via reddit.com

VMrmk TIL that in Mid-Imperial China (900s-1400s), imperial officials wore special caps that had two very long "horns" protruding on both sides which aimed to prevent them from whispering at each other during court ceremonies. Called the Zhangokfutou, it was invented by the paranoiac Song Dynasty.
jNeGM TIL there are various types of planned obsolescence, such as: contrived durability, prevention of repairs, perceived obsolescence, systemic obsolescence, and programmed obsolescence.
KOw64 TIL that Charles Joughin, Chief Baker on Titanic, helped passengers board life boats (forcibly boarding those who thought it safer to stay on the ship), drank a 1/2 bottle of liqueur, then threw chairs overboard for use as flotation devices, rode the side of the ship down while it sunk, and survived
rR0Qd TIL John Candy died a few days before the end of filming Wagons East, so according to Wiki, they used, "using a stunt double and special effects" to complete the film. Part of the special effects was just reusing a scene from earlier in the movie. The link is these scenes.
wL4do TIL Police Academy actor Michael Winslow recorded sound effects for Back to the Future Part III including the sound of Marty's feet during the "moonwalk" sequence