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TIL about fumi-e (meaning "stepping on a picture"), a representation of Jesus used by the Tokugawa shogunate in 17th century Japan to weed out suspected Christians. Those who hesitated or refused to step on fumi-e were tortured or killed.

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xW1B TIL a pencil can draw a line that’s roughly 35 miles long.
a8Evy TIL that the reason printers refuse to print without yellow ink is because they print a Machine Identification Code on every page, leaving a unique microscopic pattern of yellow dots that say what the serial number and model of the printer is, allowing the documents to be traced back to the owner.
Y7LD7 TIL octopus have nine brains – one mini-brain in each arm and another in the center of their bodies. Each arm can independently taste, touch and perform basic movements, but all arms can work together when prompted by the central brain.
OG814 TIL former UN Secretary General Kurt Waldheim's voice was used to record the longest audio greeting to extraterrestrials on the Voyager Spacecraft; approx. 7 years after the spacecraft was launched, Waldheim was publicly accused of participating in war crimes by famed "Nazi Hunter" Eli Rosenbaum
kOJEW TIL The best selling drink in every country on Earth is either Coca-cola or a drink owned by the Coca-Cola company - except for one place. Scotlands own 'Irn-Bru'. It has been the most dominant soft drink in Scotland for a century.