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TIL in the Edo period, there were style guides for courtesans on writing love letters. The texts also included advice on interacting with customers, such as "Moderation is key when interacting with customers" and "A spoken farewell should convey deep feeling; relying on a hug is mere laziness."

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wLZJW TIL while on the set on Bringing Out the Dead (1999), Nicholas Cage had a stalker who also happened to be a mime. When talking about the experience Cage said, ""I was being stalked by a mime—silent, but maybe deadly."
mYO TIL that a Fantastic Four film was created in 1994 solely to secure copyright to the property, the producers never intended it for release, although the director, actors, and other participants were not informed of this fact.
jNMGQ TIL in 1981 members of a U.S. nuclear semiotics team believed if the world ended, survivors 10,000 years in the future might not know what the radiation symbol means. So they proposed breeding bioluminescent cats that would glow when they came near radiation to serve as living indicators of danger.
m1X7y TIL in 2013, Jeff Bush was asleep in his bedroom when a huge sinkhole opened up and swallowed him and his entire bedroom. Even though his brother heard his screams, he couldn't see or rescue him in time. They never found Bush's body...
rA5e TIL The aerodynamics (downforce) of an F1 car is so powerful it could drive on an inverted road (upside-down) if it was going only 170kmh or 105mph!