The document discusses how the brain works, providing details about its structure and functions. It notes that the brain weighs around 3 pounds, is made up of 78% water, and is divided into left and right hemispheres that perform different roles. It controls vital body functions like temperature, breathing, movement, thinking and emotions. Specific areas of the brain are responsible for vision, hearing, language and planning/organizing. The frontal lobes help control emotions. In total, the brain is a highly complex organ that regulates all conscious and unconscious aspects of life through the central nervous system.