“Bigger Than T. Rex” is the obvious headline when you talk about the Spinosaurus. The partially aquatic, very large and dangerous dinosaur is the subject of a Nova/National Geographic special that airs Wednesday on PBS. The show would not have happened without some very important people here in Chicago. One of those individuals is paleontologist Paul Sereno. He joins us in studio to talk about what it was like uncovering the Spinosaurus.