Did you know that mussels and clams are sensitive to changes in water quality and can absorb pollutants? They are often used as bioindicators to detect harmful substances like heavy metals and toxins in the water. They are used in United States and in Europe to check if water is clean.
I remember someone creating a sensing system to see if the shells were open or closed. Given enough mussels, the odds of them all closing at once due to random chance instead of pollution drops to zero.
