Think about it: The mice had everything they could want. All the space they needed, all the food and water, and no threats. But maybe that was the problem. The male mice didn’t have to do anything. They didn’t have to find new food sources. They didn’t have to defend their territory. They didn’t have to protect anything. And it wasn’t just Universe 25 that went so wrong. Calhoun had done previous studies and found the same thing. He called it “behavioral sink,” when the mice just stopped doing what they were designed to do. In a previous experiment, the mouse universe he set up had space for
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