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TIL that Leo Marks, a WWII cryptographer, suspected that Germans had infiltrated the Dutch network in 1943 because all messages were being sent without any errors. To test his theory, Marks sent a message with "HH" and received "HH" in response. "HH" was a common German sign-off for "Heil Hitler."

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XaWQ TIL that when a phrase or word is slowly deteriorated over time due to pronunciation, and ends up being said or spelled incorrectly in a widely accepted way (such as, “all intensive purposes” vs “all intents and purposes”) it is called an “eggcorn”
rR1pw TIL Kelsey Grammer's father and sister were murdered, and his two half brothers were eaten by sharks
LQV0p TIL Hans Gruber, the villain of Die Hard who appears on numerous “greatest movie villains of all time” lists (AFI, Empire, etc.), was theater actor Alan Rickman's first film role.
WkOJL TIL in 2002, Tropicana aired a half-hour orange juice infomercial called "Breakfast Americana" on Lifetime, A&E, TLC and Discovery Channel. When it also aired on local CBS affiliates, some major markets drew higher ratings than NBA basketball and 'Everybody Loves Raymond'.
Bxay TIL the atmosphere on Earth at sea level is roughly equivalent to being behind 13 feet of solid concrete when it comes to radiation shielding.