Sure, we’re obsessed with movies, but not all of us are well-versed in the delicate art of actually making one. While we’ve all cultivated our opinions on what makes for good acting or directing, how many movie lovers understand what makes for great editing? Slate has an excellent video up today with editor Mark Helfrich examining this year’s Academy Award Best Editing nominees. Helfrich explains in digestible layman terms what’s so special about the way No Country for Old Men, The Bourne Ultimatum, There Will Be Blood, Into the Wild, and The Diving Bell and the Butterfly are cut together. It’s particularly interesting to hear that Into the Wild’s editing shaped the movie far beyond what the script called for, owing all of its non-linear presentation to Jay Cassidy’s work in the editing room. Check it out below.