Eric Leven is a visual effects supervisor for Tippett Visual Effects Studio, one of the biggest names in Hollywood. We'll talk with Leven about the role of special effects in films today and about his most recent film, Cloverfield. He created the giant monster-and it's scary dog-size offspring-that attack New York City. We'll also continue our series on alternative energy with a look at wind power. Guests: Eric Leven & Greg Bock