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TIL the adjective “jet-black”, meaning as dark a black as possible, derives from the color of Lignite

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loeK7 TIL that movie trailers were originally shown after the feature film. That's why they are called "trail"ers. Theaters quickly noticed that people would simply leave when the main feature was complete, so they began showing the trailers before the movie instead; the name just stuck.
NERN TIL Superman II was filmed simultaneously along with the original in 1977. Due to cost overruns and dysfunction on the set, filming on the sequel was halted only 75% completed, and the ending to Superman I changed. The filmmakers decided that if Superman I was a hit, they’d finish Superman II.
p86RA In Delhi, air quality index (AQI) levels are usually a severe 200 on a good day (anything above 25 is deemed unsafe by World Health Organization). During peak pollution periods last year they soared well into a life-threatening 900 and sometimes off the measurable scale. But as Delhi’s 11m registered cars were taken off the roads and factories and construction were ground to a halt, AQI levels have regularly fallen below 20. The skies are suddenly a rare, piercing blue. Even the birdsong seems louder.
R0ra TIL that Chief Justice John Roberts is also chief justice of the NSA’s surveillance state. He has unlimited power to appoint FISA judges.
AEAa TIL In 1832 the US Supreme court ruled in favor of the Cherokee Indians wanting to remain on their native land. President Andrew Jackson ignored the order and tens of thousands of Cherokee were forcibly removed from their homes and marched to Oklahoma. Thousands died on the mach, the Trail of Tears.