What, he wondered, if the experiment was run differently? With a few of his colleagues, he built two sets of homes for laboratory rats. In the first home, they lived as they had in the original experiments, in solitary confinement, isolated except for their fix. But then he built a second home: a paradise for rats. Within its plywood walls, it contained everything a rat could want—there were wheels and colored balls and the best food, and other rats to hang out with and have sex with. He called it Rat Park. In these experiments, both sets of rats had access to a pair of drinking bottles. The
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