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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

D1GaD TIL in 2014 a man from Oklahoma City killed his stepfather with an "atomic wedgie" - he stretched his stepdad's waistband over his head and around the neck, leaving ligature marks around his neck and blood splatter in several spots in the room.
E1147 TIL that the letter J as we know it today was not invented until the mid 16th century.
wog6 TIL Jordin Tootoo is the 1st NHL player of Inuk descent, and his older brother committed suicide after a DUI leaving a note urging him to make the NHL.
XEv4r TIL Bacteriophages are viruses that prey on bacteria and archaea, and some hope that phage therapy might one day be a useful alternate to antibiotics as antibiotic resistance becomes a bigger problem in treating deadly diseases
OolGa TIL that London is farther north than Calgary, Montreal is south of Paris, and despite being 20° further north, Reykjavik’s average temperature in January is warmer than Boston’s average temperature. The reason for milder European climates than equivalent cities in North America is the Gulf Stream.