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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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Y5lG TIL Around 85% people breathe through one nostrils at a time which changes every few hours. It affects the body’s glucose and oxygen levels and the activity of the brain hemisphere. Also explains why one nose is more stuffed up when having a cold.
0wAB1 TIL that Donald Glover admitted in a 2013 interview that he attempted to take his own life following the end of his 2012 “Camp Gambino” tour while staying in Australia.
loXOG TIL of the theory that the "monster under the bed" is an evolutionary leftover from our hunter/gatherer days. "children would fear bedtime because of the threat of wild animals."
WkZlY TIL Spacex offered all the residents of Boca Chica, Texas a buyout so they could increase the size of rockets being launched in their municipality.
awGDy TIL of a sea sponge that has a skeleton made of glass which has better strength, flexibility and fracture resistance than manufactured optic fibre.