Forget baseball. Boxing just might be our national sport. After all, the highest paid athlete in the country is a fighter. And a long awauted superfight between this generation's best boxers has earned millions in ticket sales. This hour, we explore the popularity and enduring appeal of combat sports.  The Ecstasy of the Fight; Inside the Mind of a Fighter; The Professor Who Became a Cage Fighter; The Toughest Teen in the World; Dangerous Idea: Can Real Life Superheroes Fight Crime?; 'The Hunger Games' Meets Ancient Rome in 'An Ember in the Ashes'.