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TIL telephone companies created the phenomenon of 555 telephone numbers in movies and TV shows, and 555-0100 through 555-0199 are still held back from the the public for "fictional use"

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kJdkm TIL That Bob Marley's Father was a Sixty Year Old 'Neurotic and Incontinent' World War One Veteran, who was Born in Sussex, and that Died when Marley was Ten Years Old.
newwb TIL WWII shipwrecks are an important source of "low background steel" (i.e. steel produced before the introduction of nuclear weapons) required to produced devices sensitive to radioactivity.
grVg9 TIL that when America joined WW1 they set upon purging their language of German words, Sauerkraut became “liberty cabbage,” Hamburger was rechristened “liberty steak” and German measles became "liberty measles."
BrKZk TIL there is only one white giraffe left in the world...
l71yG TIL HMS Hood was one of four planned Admiral-class battlecruisers, but was the only one of that class built