Snapped up by Paramount days before the festival started, this docu's glimpse of the US's stumbling education system and the fate of the kids it fails more than justified its pre-festival buzz.

Exhaustive and occasionally exhausting, Davis Guggenheim's film turns education statistics from numbers into people, giving faces to the children staggering through the US school system. 

Guggenheim's CV already boasts An Inconvenient Truth. In many ways, this is an even bigger wake-up call. It more than deserved the Festival's Audience Award for best documentary.