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TIL that the saliva from vampire bats acts as a anticoagulant, and is now used as an effective mediation for stroke victims. It’s called Draculin after Dracula.

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b9bRE TIL traditionally bubblegums are made using tree resins, today most bubblegums are made from synthetic materials, such plastic and rubber.
vmv4 TIL that Peter Capaldi, the 12th Doctor, personally sent a video in character to an autistic boy to help him cope with his grandmother’s death (video in comments)
XEA7Q TIL Sir Anthony Hopkins once memorised an entire seven-page courtroom speech and delivered it in one go in the movie Amistad. Because of this, Steven Spielberg insisted on addressing him as Sir Anthony, instead of Tony, out of respect.
8eapa TIL cry rooms were an amenity movie theaters had starting in the 1940s. These were small areas at the back of a theater where those with unruly kids could continue to watch the film. The presence of these rooms declined greatly by the 1970s due to the rise of multiplex theaters.
p8N7A TIL of a drug called TGN1412 that went through phase 1 clinical trials. Six men were given the drug and suffered catastrophic effects. Fever, severe pain, vomiting, multiple organ failures, swollen heads and limbs needing to be amputated.