The human brain is the command center for the human nervous system. It receives input from the sensory organs and sends output to the muscles. The human brain has the same basic structure as other mammal brains, but is larger in relation to body size than any other brains. With a smarter brain, there are all-round cognitive benefits for attentional focus and grit, problem solving efficiency, learning capacity and memory - much like there are all-round physical benefits to being in good shape physically. Having a higher IQ also directly improves health and life-expectancy!