Explore Universe 25, a 101-square-inch tank designed as a utopia for mice and a mirror of human behavior. Every detail of the structure was crafted with comfort in mind: a never-ending supply of food; a constant 68 degree F temperature; a self-cleaning environment and spacious apartments for its inhabitants. So what contributed to Universe 25's spiral into degradation and violence? And why were a subset of mice dubbed "The Beautiful Ones?"

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