The common garter snake is a small snake that moves by undulating its spine. This skeletal structure also plays an essential role in humans. We will see how current medicine uses three-dimensional imaging techniques to correct curvature of the spine. Finally, we meet an ergonomist whose goal is to prevent back pain on the job. The sloth is a discreet animal that spends most of its time sleeping.
Humans sleep much less.
But sleep studies prove that our daytime performance depends on brain activity that occurs at night. This sleep exploration ends with a chronobiologist who demonstrates that night work threatens the daily cycles of sleeping and wakefulness. We study how some parrots like the Amazon can reproduce words. We'll then see that in humans the two hemispheres of the brain play a role in mastering language. We will also meet a specialist in computerized speech-recognition systems.