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Comparison and Contrast Essay The human brain performs an incredible number of tasks. The cerebral cortex is the part of our brain which houses rational functions. It is divided into two halves, the right and left hemispheres. They are connected by a thick band of nerve fibers, which sends messages back and forth between the two parts. Usually there is one side that is more dominant. The left hemisphere controls the right side of our body. About 95 percent of us use this side for language, math, judging t