oysters-noaa.jpgSolar panels perched atop poles provide a low voltage current that causes a chemical reaction in seawater, building up limestone on the electrified metal. The ready supply of shell-building minerals will help the oysters, decimated here and elsewhere by overharvesting, pollution, and disease, says James Cervino, a professor of marine biology at Pace University in New York City. Oysters need hard surfaces to attach to and access to minerals to form their shells. (Christian Science Monitor )