The water quality in Warsaw, the capital city of Poland, is monitored by 8 clams. If the water gets too toxic, they close, and this triggers analyses that can immediately shut off the city's water supply, if at least 4 are close.
The water quality in Warsaw, the capital city of Poland, is monitored by 8 clams. If the water gets too toxic, they close, and this triggers analyses that can immediately shut off the city's water supply, if at least 4 are close.
