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Seven mice entered paradise. Unlimited food. Perfect weather. Zero predators. Five years later, every single one of them was dead. And not a single death had a medical cause. Most people assume the mouse colony collapsed because life was too easy. That's wrong. The real reason is far darker — and once you hear it, you'll never look at a crowded city the same way again. In this video, we explore the psychology of social collapse: why meaningful roles vanished inside Universe 25, how the "behavioral sink" turned mothers against their own pups, and why the eerily perfect "beautiful ones" chose isolation over reproduction. Featuring the groundbreaking work of ethologist John B. Calhoun, we unpack the uncomfortable truth about what happens when a society runs out of purpose — and whether humans are heading the same direction. ⏱ Timestamps: 0:00 – Seven mice enter a literal paradise 0:25 – The lazy explanation (and why it fails) 0:35 – 24 earlier experiments all ended the same way 1:10 – The 9‑foot enclosure with “walk‑up apartments” 1:30 – Population explosion: 600 mice by day 315 1:50 – The behavioral sink begins – violence, chaos, and withdrawal 2:30 – Mothers abandon, forget, and cannibalize their own young 3:15 – The "beautiful ones" emerge – healthy, groomed, and completely inert 4:10 – Population peaks at 2,200 – and never grows again 4:35 – The last birth occurs on day 920; extinction follows 5:05 – The real killer wasn't comfort – it was the disappearance of meaningful roles 5:30 – Calhoun's surprising optimism: we can still choose differently 📚 Key Studies & Sources: Calhoun, J. B. (1973). "Death Squared: The Explosive Growth and Demise of a Mouse Population." Proceedings of the Royal Society of Medicine. Calhoun, J. B. (1962). "Population Density and Social Pathology." Scientific American. Calhoun, J. B. (1971). "Space and the Strategy of Life." – on "ideational generativity" and human solutions. Adams, J. & Ramsden, E. (2024). Rat City: Overcrowding and Urban Derangement in the Rodent Universes of John B. Calhoun. #MouseUtopia #psychology #sociology #Universe25 #BehaviouralSink #philosophy

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