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TIL the speed of light is reducible to 1 Planck length / 1 Planck time. With all the varying measures of distance (feet, meters, miles, kilometers, astronomical units, light years) and all the different measures of time (…seconds, minutes, years, millennia), 1/1 is extremely satisfying!

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JYlW1 TIL the “my phone is listening in on me” meme is not entirely baseless: Study's findings suggest that eavesdropping activity would not be detected by current security mechanisms. Not only microphones, but also seemingly harmless motion sensors are a potential eavesdropping channel in smartphones.
Bagb TIL That smokers clear caffeine from their system 56% faster than non-smokers.
69wQ7 TIL the 'All Red Line' was a system of electrical telegraphs that linked much of the British Empire from 1902. 8,000 tonnes of cable was needed to complete the longest section from Canada to a Pacific island. On completion, 49 cable cuts would be needed to isolate the United Kingdom
neKmW TIL Cinderella Castle at Tokyo Disneyland was once home to the Cinderella Castle Mystery Tour, an attraction involving encounters with classic Disney villains. This featured a finale with The Horned King from The Black Cauldron, making it one of the only uses of that movie in Disney Parks.
vwO4 TIL in 2007 a Doberman Pinscher named Khan saved a baby girl from a deadly King Brown snake attack. At first the dog tried nudging the baby from danger. As the snake was about to strike, Khan grabbed the girl by the diaper, flung her to safety and took a venomous bite to the paw himself.