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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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VMZBB TIL T-Rex didn't roar, but it instead made a much more ominous deep, rumbling sound that it could produce without even opening it's mouth.
6EnY7 TIL about the 'Harlem Hellfighters' WW1's African-American regiment who were the first Allied unit to reach the banks of the river Rhine in November 1918
6mk8 TIL that when people die in huge crowd ‘stampedes’, it’s rarely from being trampled, it’s from being crushed and suffocated (while still standing) by densely packed bodies.
5YEJ9 TIL the word ancient Egyptians used for solving mathematical problems that involved finding unknown quantities was "Aha".
VVbB TIL in Stockholm, they have a lottery where good drivers can win the money bad drivers pay in fines