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TIL mirrors reflect slightly more green light than other colors, which causes a “mirror tunnel” (such as two mirrors facing each other) to appear greener further down the tunnel.

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9n0M TIL there have been computers programmed in “ternary” instead of the conventional binary. One such computer, built by the Soviets in 1958, had distinct advantages over binary computers such as increased power efficiency, cheaper parts and easier implementation of certain operations.
XAMr TIL the castle from the Rocky Horror Picture Show is now a hotel that you can spend the night in!
wLG8o TIL scientist Henry Cavendish suffered from extreme shyness “bordering on disease”. He discovered several laws not attributed to him because of this shyness. Had secret staircases in his home to avoid his housekeeper -females caused him “extreme distress” and devised a note system to talk to her.
nn1d TIL in Australia, “Black Friday” refers to a series of bushfires that wiped out whole towns and killed 71 people
bP9j TIL pure Vanilla extract has at least 35% alcohol in it, equal to Jägermeister, and anyone can buy it. Yes it will get your drunk.