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TIL in 1944 by a huge coincidence ,a crossword puzzle was printed with answers all containing D-Day operation “code names”, which sent MI-5 into a panic thinking their invasion plans had been discovered.

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P1YWZ TIL about Antonie van Leeuwenhoek, an Dutch Button salesman who in 17th Century managed to build an eyeglass 10 times more powerful than the best Microscope of the day and discovered millions of bacteria present in single drop of water He is sometimes knows as father of Microbiology
ZxRp TIL there is a $2 millon Leica Lens owned by a guy in Qatar. Apparently it rocks, but no photos have ever been published to prove its ability.
9jyB TIL of Belphegor’s Prime. It’s a prime number that is also a palindrome. It’s named after the Prince of Hell for ingenious inventions because it contains two sets of 13 zeroes with 666 in the center. The palindromic prime number is 1000000000000066600000000000001.
Oae4 TIL In 2006, The FBI planted an informant in a Southern California mosque who pretended to be a radical Muslim and the Muslims at the mosque reported him to the FBI.
9gbX TIL: That the USS Constitution is the oldest commissioned ship still in active service.