The Incredible Human Machine 1986.
National Geographic takes you and your family on a truly fantastic journey through the wondrous inner world of THE INCREDIBLE HUMAN MACHINE. Explore the fascinating, microscopic universe that exists within us all. How does the eye adjust to changes in light? How do our muscles enable us to move? How does the eardrum process sound? With the help of sophisticated photographic techniques you are now able to discover the wonders of this internal world and marvel of THE INCREDIBLE HUMAN MACHINE.