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TIL about a poisonous lagoon at an abandoned quarry that was dyed black because the water's naturally tropical blue colour was considered too inviting to swimmers.

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via reddit.com

woLOY TIL: Nintendo launched a public relations and legal campaign in the 80's to prevent people from using "Nintendo" as a term to describe video games because they feared it would genericize the name and prevent them from keeping their trademark.
xd1w TIL about the Tetris effect, in which people who play Tetris for extended periods of time start seeing falling tetris blocks in their sleep as well as regularly identifying tetromino shapes in their everyday life, such as the layout of boxes on supermarket shelves or patterns on certain buildings.
og6A TIL that Chinese mathematician Yitang Zhang could not get an academic job upon graduating, having to work as an accountant and a delivery worker for a New York City restaurant. He later went on to solve a math problem that had been unsolved for 150 years and won a MacArthur Genius Grant
0VeN TIL that Quakers call the months of the year and days of the week by number only, in order to avoid using names of pagan deities.
KOEgQ TIL about the 'Time Cube', a conspiracy theory in which modern education and physics are hiding the ultimate truth: That each day actually consists of four separate simultaneously occurring days.