OK so I didn't even watch this because I already know what's going to be said just from the headline.  Why is everyone amazed by this? Clams, mussels, oysters etc are filter feeders, water purity will be reflected in thier growth, general health and lifecycles - this has been known for years because bad riverways have caused a lot of dieback with the industries for oysters, clams and mussels; for that system to be used for water monitoring is the same methodology as using canaries for a mine, so the idea is not even remotely new.  Technically you could use barnacles, because nobody likes them, but bigger filter feeders like clams mean it's easier to see if the water purity becomes tainted as thier "goldilocks zone" for water purity is quite narrow, so if the water is tainted you'll know quite quickly.<br><br>No I'm not in the profession or anything, I just know stuff.  I'm a handyman by trade. Surely I'm not the only person able to join the dots?,(reply>), Youxwhere wrong nice to know you like to look at someone finding all the facts go to their video say something incorrect then say you won't watch it because you already know great way of thinking