Deformed frogs have been appearing around the country, particularly in the Midwest, and scientists have speculated on a variety of causes: from chemicals in the environment, to ultraviolet radiation, to parasitic flatworms. Now, new research points to a mix of chemicals in the water as the culprit. Janet Raloff (RAL-off), senior editor of Science News and Living On Earth’s science correspondent, speaks with Steve Curwood about the latest findings.