It’s Oscar season and Hollywood is once again celebrating the best films of the year. It would seem we're a nation that's obsessed with movies, spending billions of dollars to watch them every year, and celebrating them with a variety of awards ceremonies. But what separates a classic from a box office disaster? This hour, we turn to a few of the people who know film best -- the critics, actors and directors who've devoted their lives to the si A.O. Scott on the Art of Criticism; Manohla Dargis Recommends 'Boyhood'; Roger Ebert on Film Criticism; Crying at the Movies; How Alfred Hitchcock Created Suspense Through Music; An Inside Look at Hollywood's Death-Defying Stuntwomen.