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TIL about the "Mad Hatterpillar" Uraba lugens, the gum-leaf skeletoniser, Nicknamed the mad hatterpillar because of its distinctive exoskeletal feature. Every time it sheds the head portion of its exoskeleton, stays attached creating a stack of increasingly large heads!

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4XkVg TIL that New Jersey received the first area code, 201, and D.C. received the second area code, 202, because the number 1 was not used office directories and the leading single pulse made by 1 was automatically ignored 1940s telephone equipment.
kJe0d TIL In 2012, archeologist discovered an ancient mosaic meme in Turkey. It reads be cheerful, live your life in ancient Greek.
pjyQ TIL the Allies calculated the number of tanks being manufactured by Germans during WW2 by using the serial number of captured/destroyed tanks and statistics. The statical and actual figure differed by a value of 1.
eGE5 TIL that the Chinese city of Guangzhou had no subway whatsoever 20 years ago. Today, its subway system has 186 stations and is 191 miles/307 km long. It is today the world’s fourth busiest metro system, beating New York’s, London’s, Moscow’s and Paris’ in terms of ridership.
4XKoJ TIL in 1918 World War 1 censors minimized early reports of the flu epidemic's death toll to maintain wartime morale. Newspapers in neutral Spain were free to report on the epidemic's effects, creating a false impression that Spain was the hardest hit, and giving rise to the name "Spanish flu".