The Nervous System
• There are more nerve cells in the human brain than stars in the Milky Way.
• On average, you only use 4% of the cells in your brain at any one time.
• The left side of the brain controls the right side of the body and the right side of the brain controls the left side of the body.
• The nervous system can transmit impulses as fast as 100 meters per second.
• There are almost 50,000 kilometres of nerves in your body.