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TIL the spiders Chrysso venusta and Cyrtophora cicatrosa can rapidly change their colours, similar to ectotherms such as reptiles, frogs, cephalopods (including species of squid, octopus, cuttlefish), insects, crustaceans and fish

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yQKNe TIL of a highly effective treatment for soldiers with PTSD. EMDR: Eye Movement Desensitization and Reprocessing
8ekja TIL about the Anti-Tank Dog. Dogs taught to carry explosives to tanks, armored vehicles and other military targets. It failed because they would train the dogs using their own tanks and would mine friendly tanks instead.
7GRM TIL Robin Williams took his video-game-loving son’s advice when deciding to name his daughter Zelda.
dry9 TIL the real crew on the Captain Phillips ship say that he is a fraud, he endangered them, the film is a lie, and they’ve sued for “willful, wanton and conscious disregard for their safety”.
nWmnb TIL of Treasure Island, which is the world's largest natural island sitting in a lake (Lake Mindemoya) that sits on an island (Manitoulin Island) inside of a lake (Lake Huron).