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Currently you are able to watch "Critical Mass" streaming on Tubi TV for free with ads or buy it as download on Google Play Movies, YouTube, Apple TV. It is also possible to rent "Critical Mass" on Google Play Movies, YouTube, Apple TV online
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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.