In a time when directors are as much celebrities as the actors they direct, just as prone to the pokes and prods of the media and more reachable by the public than ever before with the advent of social media, Christopher Nolan manages to remain something of an enigma. The director of such complex films as Inception, Memento and, erm, The Dark Knight Rises remains as mysterious and interesting as the movies he makes. With the release of his latest - humanistic sci-fi film Interstellar, which has had a much more divisive reaction than he's used to - Nolan has come under the lens again, hitting the campaign trail of the hype machine pretty hard, but still managing to keep his cards pretty close to his chest. Who is this filmmaking dynamo who can craft big, bombastic superhero flicks and small indie thrillers with indie aplomb? Where did he come from? What makes him tick? And what does he keep in that flask he's always carrying around on set? All will be revealed in the twenty things you didn't know about Christopher Nolan...