Human/Mouse Utopia: "Universe 25" (video)

Brilliant.org, Today I Found Out, 12/28/18; Pat Macpherson, Seth Auberon, Wisdom Quarterly

Guy Tried to Build a Mouse Utopia and it all Went to Heck

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In 1968 an expert on animal behavior and population control named John B. Calhoun built what was essentially a utopia for mice that was purpose-built to satisfy their every need. Despite going out of his way to ensure the inhabitants of his perfect mouse society never wanted for anything, within two years virtually the entire population was dead. What happened? Text: todayifoundout.com

Sources

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