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TIL the Earth's temperature dropped 2 degrees Celsius after airplanes were all grounded after 9/11

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wLJRE TIL the Psychedelic Frogfish, first scientifically described in 2009, has a number of colorful, kaleidoscopic stripes arranged in a fingerprint pattern. The fish lives among the similar-appearing coral rubble around Ambon Island, Indonesia where it can hide by crawling into narrow crevices.
Me5PK TIL the solution to the world's largest math problem, calculated in 2016 using a supercomputer, takes up 200 TB of text (equal to the entire content of the world’s largest library). The award for solving the problem, posed in the 1980s, was $100, and was given to the three researchers who solved it
wLXKE TIL there is a "forest" covering over 100 acres consisting of over 40,000 trunks of a single tree. The trunks are all connected to the same root system and collectively weigh 6000 metric tons. The root system is an estimated 80,000 years old, though each trunk only lives about 130 years.
l6bB TIL around 762, the demand for books in Baghdad was so high that any traders who brought books were given the weight of the books in gold in return.
xZwb TIL The largest recorded snowflake ever recorded was 15 inches wide, and 8 inches thick.