Watch Critical Mass

Things aren't looking too good for the world's population; as we multiply at an alarming rate there is not enough food, space... or sense. With the planet bursting at the seams the intelligence and physiological traits that make us human are now crucial to mankind's survival. This intelligent film interweaves a fascinating 1960s rat experiment with a slick snapshot of today's urban jungle.

Critical Mass is a 2013 documentary with a runtime of 1 hour and 42 minutes. It has received mostly positive reviews from critics and viewers, who have given it an IMDb score of 7.9.