[Annotatie]: """"Did you know that about 20 percent of the body's energy is used by the brain? The average adult brain weighs 3 pounds (1.5 kilograms). Discover more fascinating facts in How the Human Body Works - The Nervous System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function properly. Each book explores the characteristics and interactions of these systems, their makeup, and their importance""""-
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