Investigating Body Systems introduces readers to the main organ systems of the human body. The science that makes each system function is clearly explained, and new research on the body's processes are explored. Fact-check boxes help separate fact from fiction, and key figures in the development of the scientific method are identified. Investigating the Nervous System Dr. William Keen was one of the first surgeons to successfully remove a brain tumor in 1888. But he could not have done it without a detailed knowledge of the nervous system. The control and command center of the whole body, we wouldn't be able to breathe, have a heartbeat, avoid danger, or sleep without it. Find out what illnesses affect the nervous system and how medical research has advanced our knowledge.