When Jellyfish Attack!

With summer officially upon us, swimmers will soon head to beaches all over the Pacific Northwest. But swimmers might find their usual watering holes more dangerous this year. Large clusters of jellyfish are becoming increasingly common. Some scientists blame climate change for the large jellyfish blooms. What are the threats to swimmers and the environment? Timothy Essington, an associate professor of aquatic and fishery sciences at the University of Washington, talked with David Hyde about it.