In this episode, the Wildlife Conservation Society's Stephen Sautner and John Delaney talk about the appearance of a beaver in New York City for the first time in 200 years and journalist and author Alan Weisman talks about our reaction to the event and other similar stories. Elaine McSherry, winner of the AccesScience '07 competition, explains why it's good to be explain science. Plus we'll test your knowledge about some recent science in the news.