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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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x6EE1 TIL that Webster's Third, basis of the current Merriam-Webster Dictionary, was widely criticized when published in 1961 for condoning the use of "ain't" among other permissive changes
wLLyY TIL of Georg Elser, the man who missed killing Hitler by 13 minutes
epkrL TIL Salamanders retract their eye balls into their mouth cavities to help them swallow their food.
BrA1K Today I learned that humans are the only animals that can blush and perhaps the only animal that can feel embarrassment. Blushing appears to be a unique human expression 'the most peculiar and most human of all expressions' which happens when blood vessels in the face dilate when embarrassed.
1aQBW TIL that during the occupation of Denmark in World War II, 7200 Jews, aided by local resistance fighters, escaped Nazi internment. Of the Jewish community living there, only 500 were captured, and only 51 did not survive.