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TIL how one way mirrors work, One-way mirrors are coated with a half-silvered layer, allowing the mirror to reflect half the light that strikes its surface.

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N8Db TIL that the Type A/B Personality Theory was actually invented by the cigarette industry in the 1950’s to prove coronary heart disease and cancer were risks related to high-stress personality types instead of tobacco use.
M7mab TIL Plato once offered a literal definition of humanity: he called a human “a featherless biped”. Cynic philosopher Diogenes took it literally – he plucked a chicken, strode into Plato’s lecture hall & announced, “Here is Plato’s man.” Plato had to add “with broad, flat nails” to save face.
GYEoQ TIL the first food and drink consumed on the Moon was communion by Buzz Aldrin
4aQR TIL The Great White Shark is food for Killer Whales, and that the smell of one of their own, dead in the water, will rapidly drive all of the GW Sharks in the area deep into the ocean and far away from land for the rest of the year.
R5m66 TIL Timbuctoo was a Black settlement in New York in the 1840s, founded after abolitionist Gerrit Smith gave away 120,000 acres of Adirondack land to free Black men to help them qualify to vote. Much of that land is now part of the John Brown Farm State Historic Site.