Examines the factors affecting the human voice, including pitch, volume, and rhythm, and provides exercises to demonstrate how different elements influence the sound that is heard.
Uses text and illustrations to explain the workings of the human respiratory system, discussing why people need to breathe, how oxygen enters the body, and the effects of pollution on the lungs.
The structure of the eye, how the brain interprets information received from the retina via the optical nerve, modern corrective eye surgery techniques, and how to take care of your eyesight.