congenitaldisease: Rats have an unwarranted bad reputation. However, rats have been known to exhibit sympathy. Scientists set up an experiment in which a rat would pull a lever to be rewarded with chocolate. If the rat pulled the lever, another rat in

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congenitaldisease: Rats have an unwarranted bad reputation. However, rats have been known to exhibit sympathy. Scientists set up an experiment in which a rat would pull a lever to be rewarded with chocolate. If the rat pulled the lever, another rat in

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