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TIL of the metaphor of the "missing stair", where a problematic person in a community is discretely worked around and warned about, rather than openly addressed

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WOMB TIL the Tampa Bay Lightning (NHL team) installed two Tesla coils in its stadium in 2011, just so they could shoot lightning whenever they scored a goal.
6EMd8 Hong Kong-based students, Sum Ming Wong and Kin Pong Li designed a door handle that uses light to always keep itself sterilized. The students were inspired by the SARS outbreak in the 2000s and figured that a self-sanitizing door handle is more effective than the chemical-based cleaning processes we are using right now. The handle is made of a glass tube with aluminum caps at each end and the entire handle is covered in a powdered photocatalytic coating made from a mineral called titanium dioxide. The bacteria is decomposed through a chemical reaction that is activated by UV light reacting with the thin coating on the glass tube.
5YnBp TIL that many WW1 soldiers on the Western front spontaneously declared truces for Christmas 1914. On both sides, they left their trenches to bury their dead, hold church services, and trade cigars and other small goods in no man’s land.
epZ1g TIL Wisconsin produces over half of all cranberries in the world. 5% is sold fresh: majority is for sauce, juice, dried fruit, etc. Settlers called the fruit “crane berry” cause the blossoms resemble the head of a Sandhill crane. It takes about 4,400 cranberries to make 1 gallon of juice.
W7VoL TIL that when a man had a heart attack at a grocery store in rural Minnesota, 20 people lined up and performed CPR on him for over 90 minutes until paramedics arrived - and he survived