Well, this is fascinating! The city of Poznan, Poland uses eight clams to control their water supply. When the water is clean, they remain open, but close when contaminated, closing a sensor harmlessly glued to their shell. Computers do the rest. After three months, the clams are returned to their original home and replaced with new clams. #science #health #clever https://kottke.org/24/12/eight-clams-control-this-polish-citys-water-supply