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TIL that the compliance-gaining technique of adding “but you are free to refuse” after a verbal request has been found to double your chances of getting what you want.

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mxJkv TIL that the FBI has an entire fake town for training agents. Hogan's Alley has a bank, post office, hotel, laundromat, barber shop, pool hall, shops, and homes. The town is populated by actors who roleplay parts like bystanders, terrorists, bank robbers, and drug dealers so scenarios always change
JAZB TIL that the famous melody of the song “Lowrider” is actually a saxaphone and harmonica playing together.
Z8wXp TIL ‘Band of Brothers’ strived for historical accuracy to such an extent that multiple WWII veterans were flown in from all over the world to advise on the weaponry, battle tactics, and combat situations. As a final check, the veterans screened previews of each episode prior to their release.
OovvL TIL that Immanuel Kant promoted "scientific" racism, giving a hierarchy of four races: white Europeans "always advance to perfection", yellow Asians "can never reach the level of abstract concepts", black Africans "can be educated but only as servants", and red Amerindians "cannot be educated"
VMV8m TIL that the saying “put a sock in it” is believed to come from the early 20th century, when people would stuff socks into their gramophones (a device for recording, reproduction and sound), to make it quiet, because the gramophones did not have volume controls.