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Currently you are able to watch "Critical Mass" streaming on Shout! Factory TV for free with ads or buy it as download on Amazon Video, Apple TV. It is also possible to rent "Critical Mass" on Amazon Video, Apple TV online
You can also stream the title for free on Kanopy.
Things aren't looking good for the world's population; as we multiply at an alarming rate there is not enough food, space... or sense. This intelligent film interweaves a fascinating 1960s rat experiment by Dr. John B. Calhoun with a slick snapshot of today's urban jungle.
