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In 1968, ethologist John B. Calhoun created "Universe 25." It was a mouse utopia. unlimited food, unlimited water, zero predators, and perfect climate control. It was designed to support 3,800 mice. But the population peaked at just 2,200 and then collapsed to zero. Why? Because without the struggle to survive, the mice broke psychologically. They formed violent gangs, mothers abandoned their babies, and a group called "The Beautiful Ones" emerged—males who stopped fighting or mating and did not
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