A lot of perfectly good film show their cards early, establish a unique premise and let the audience explore a topic at a leisurely pace, without much in terms of surprise. this film is not one of those films.

This is a must-see and one of the best documentaries - and films - of this year.

It is neither dumb nor smart enough to be fun, and spends way too much time with its boring human characters.

It's the kind of movie you'll want to see a second time with someone who hasn't seen it yet, to remember what it was like to watch it for the first time.