the federal agency says poorly designed covers can trap swimmers, especially young children, under water. >> hold the butter, professors at the university of maine, yes, it had to be there, have found an eco-friendly use for lobster shells instead of throwing the shells away, they're being used to make biodegradable golf balls. joe carter of hln sports cracks open this story. in today's "start small, think big." >> reporter: these are the sights and sounds of maine's lobster industry. but here's a new one. it looks and sounds like a golf ball, but it's made of recycled lobster shells. >> it's a dynamic, exciting combination, lobsters and golf. >> reporter: the mix an idea from one of robert bayer's graduate students and took form one night in his kitchen. >> i did it on a whim.