The Playlist:
Who hasn't wanted to go back and fix past mistakes? Or travel forward and see what's in store for you and for the world? It's for these reasons that time travel has remained such a popular plot device, from H.G. Wells' "The Time Machine" to the long-running TV show "Doctor Who" to this week's "Looper," the wildly acclaimed sci-fi action-thriller from "Brick" director Rian Johnson, starring Joseph Gordon-Levitt, Bruce Willis and Emily Blunt.
