boingboing.net

l7LNB 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.
5VDQp TIL the universe is not "locally real"—the evidence provided by 2022 Nobel Prize in Physics recipients John Clauser, Alain Aspect, & Anton Zeilinger, who showed that objects are not influenced solely by their surroundings ("local") and may also lack definite properties prior to measurement ("real").
9wDPG TIL: 1993’s Macarena (which inspired one of largest dance crazes in history) song lyrics are about a girl who cheats on her boyfriend when he enlists in the military by having a ménage à trois with two other men.