Science writer Seth Mnookin set out to write a book on whether vaccines were dangerous, but discovered the issue was more complex than he'd thought.

Seth Mnookin teaches in MIT's Graduate Program in Science Writing. His most recent book, The Panic Virus: The True Story Behind the Vaccine-Autism Controversy, was one of The Wall Street Journal's Top Five Health and Medicine books for 2011 and is a finalist for the Los Angeles Times Book Prize. He is also the author of the 2006 New York Times-bestseller Feeding the Monster and 2004's Hard News, which was a Washington Post Best Book of the Year. He's a contributing editor at Vanity Fair and blogs at the Public Library of Science.

This story originally aired on June 9, 2013.