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TIL that when a metaphor stops needing its imagery to be understood and becomes idiomatic ("footage", "fly off the handle", "blow off steam"), it is considered "dead".

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W76dY TIL that the pathogen Streptococcus Group A literally wears the "skin" of red blood cells that it's killed, to camouflage itself from the immune system.
VBwDQ TIL Bruce Willis put out two albums back in the 80’s. One of his most played tracks is a cover of Under the Boardwalk.
LkVkZ TIL that between 1937 and 1939, 100k Irish children were encouraged to seek out the oldest person they knew and gather their stories. This has been compiled into an archive searchable by any topic ranging from the supernatural to natural remedies.
D1rGJ TIL about Michele Mouton, a former French rally driver. After finishing runner-up in the 1982 WRC, she started competing in the infamous and savage Group B, which was later banned after a string of deaths. Mouton retired as a result, and she remains the last woman to compete in top-level rallying.
91dD TIL The term “Fragging” used in video games originated during the Vietnam War, and was the act of throwing a live grenade in your commanding officers tent while he slept… with over 900 cases towards the end of the war.