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The Effects of Overpopulation by Rat Experiments
John Calhoun wanted to find out if there was a natural limit on the growth of populations when all social order breaks down. In one of calhoun's most influential experiments, he rents a nearby barn and divides it into four pens with equal sizes. And these partitions are electrified, meaning that the rats can only enter an exit into the four pens through the ramps that are provided.