The document provides an overview of the human brain including its definition, functions, main parts, and some fun facts. The brain is located in the skull and controls mental and physical processes. It has three main parts - the cerebrum, cerebellum, and brain stem. The cerebrum is involved in thinking and memory. The cerebellum controls coordination and balance. The brain stem connects to the spinal cord and controls automatic functions like breathing. Some key facts are that the brain uses 20% of the body's energy and produces more electrical impulses daily than all the world's telephones combined.