Now, bivalves are back, but they’re not for eating. These oysters have a mission: ecological restoration. The Billion Oyster Project is an ambitious, volunteer-driven initiative manned largely by NYC middle school students. Why oysters? They can filter toxins from up to 30 gallons of water a day, helping restore the harbor’s ecosystem, which includes crabs, sea squirts and other aquatic wildlife. Project manager Samuel Janis says when kids “see the restora
