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TIL of “The Shadows from the Walls of Death”—an 86-paged book considered to be one of the deadliest tomes in the world. Each page contains a sample of wallpaper saturated in a lethal amount of arsenic and any contact with bare skin can prove fatal.

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via reddit.com

QNGma TIL that the voice actor for SpongeBob SquarePants, Tom Kenny, also voiced the Ice King in Adventure Time and the Mayor in The Powerpuff Girls. His versatility and iconic roles have made him a legend in the world of animation.
LQrXQ TIL Kellogg's cofounder John Kellogg ran a sanitarium in Battle Creek MI where his cereals were part of the patient's diet. Future competitor CW Post was a patient in 1891, settled in the same town and started selling his own knock-offs of Kellogg's cereals and even opened his own sanitarium in 1892
pEwG TIL an estimated 400 women disguised themselves as men to fight in the US Civil War, including one whose cover was blown when she absentmindedly tried to put her pants on over her head, thinking they were her dress
KOKv9 TIL about a student nurse called Lupe Hernandez who, in 1966, invented hand sanitizer (alcohol gel). She realised that if alcohol was in gel form, it could clean hands when people had no access to soap and water.
1aBad TIL that the American version of the music video for Soul Asylum's "Runaway Train" features 36 images of missing children. The music video helped resolve 26 of those cases.