In 1968, an American scientist built a perfect "mouse utopia" with unlimited food, water, and shelter, but overcrowding shattered the mice's social bonds until the entire population died out

In 1968, scientist John B. Calhoun created Universe 25, a perfect mouse habitat with unlimited resources, but overcrowding led to the collapse of social structures and the eventual extinction of the population. Learn how this experiment reveals the complexities of community health and social bonds.

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