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
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