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TIL Operation Tracer was a top-secret WWII mission in which six men were to be buried alive inside the Rock of Gibraltar so they could monitor enemy movements after the Rock’s capture. There was no way out and anyone who died within the chamber would have to be embalmed and cemented into the floor.

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6Rd8 TIL “From whence” is grammatically incorrect. As “Whence” is defined as “From where”. So people who use it are essentially saying “from from where”
oRN1r TIL that breast cancer used to be known as "Nun's disease" due to the higher prevalence amongst nuns, who were at increased risk due to their celibate lifestyle. An association between reproductive history and cancer risk wasn't proven for about 250 years after it was associated with nuns.
neeJB TIL if a daddy longlegs loses one leg to a predator, it then walks with a 'strot' where it dribbles its body on the ground like a basketball with every stride. If it loses two legs, it turns to 'bobbing,' where the vertical plane of movement becomes pronounced
0wQwj TIL a NASA-funded research project led to a dolphin being given LSD, and sexual encounters between the dolphin and the scientist
N7OXJ TIL of the Lighthouse of Maracaibo; a weather system appearing in Venezuela approximately half the year which results in near-continuous lightning for ten hours a day.