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TIL Poland's cities of Warsaw and Poznan utilize teams of live mollusks to detect impurities in drinking water at 50 discrete water treatment plants. When 4 or more mussels are detected to have closed (using magnetic sensors) the water supply shuts off.

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Z1mY TIL China practices “Panda Diplomacy” wherein the government gifts Pandas to other countries to improve their relations, a practice dating back to the 600s
poRO TIL newborns start at the age of 1 in China and other east-asian cultures. And at the beginning of Lichen(event during February) one year is added to the person’s age. So people may be one or two years older in the ‘Asian reckoning’ traditional system than in the Western system.
Z8Yxp TIL, In 2008, the country of Rwanda banned plastic bags and, in early 2019, banned all single use plastics.
VMn18 TIL While constructing a tunnel in Denmark, Stone Age artifacts were uncovered in the aerobic clay. Among the discoveries was a stone axe with wooden shaft still attached, estimated to be 5,500 years old.
yDBw TIL Christians in South Korea have been aggressively attempting to convert the nation to Christianity, even going so far as to burn Buddhist temples and decapitate statues of the Buddha