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TIL in South Asia they call pajamas "night suits."

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loR1G TIL, former Air Force Capt. Robert Salas, who was at Malmstrom Air Force Base in Montana in 1967 when 10 ICMs he was overseeing suddenly became deactivated - at the same time base security informed him of a mysterious red glowing object in the sky
eMM5 TIL: In 2005, a group of MIT students wrote a program, SCIgen, to generate fake academic papers, with 16 published by Springer and over 100 by IEEE. These papers were presented over 30 conferences between 2008 and 2013.
5V7DQ TIL Manchu arrowheads came in many different designs, military, hunting or target, some to be retrievable without damage, some to whistle only, some to whistle and kill (the animal was startled by the whistle, making them easier to hit), some to kill by blunt force, or spear fish or small game.
4XEZ6 TIL that the famous 500 year old Treaty Oak was deliberately vandalized in 1989 with enough herbicide to kill over 100 oak trees. It managed to survive and still thrives today, albeit two-thirds it’s original size
OGeQg TIL Narwhals add a layer to their tusks every year they are alive and, much like tree rings, they show the living conditions that the narwhal experiences during that year of their life