Watch Science & Weather - The Incredible Human Machine

Science & Weather Season 1 Episode 9

Season 1 Episode 9

First Aired: January 1, 2008

Description: National Geographic takes you and your family on a truly fascinating 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? More