Fossil hunters have found what is thought to be the most-complete skull of a pliosaur, the largest carnivorous reptile to have ever lived. The skull is 6 feet long and its teeth are intact. Paleontologists believe it will add in significant ways to our understanding of this ancient sea creature. Host Marco Werman speaks to Judyth Sassoon, a postdoctoral researcher at the University of Bristol who specializes in the pliosaur.