How do jellyfish work?

This summer, a swarm of jellyfish disrupted operations at a coastal nuclear power plant in France; the same thing happened last year, when jellyfish mucked up the mechanics so badly, the entire plant temporarily shut down. So, what's with all the jellyfish? The World's Host Carolyn Beeler speaks with Monty Graham, director at the Smithsonian Environmental Research Center, about the species - including the one named after him.