Dr. Brain and Geo board a ship that shrinks down to microscopic size and gets swallowed by Geo's friend Phoebe, trapping them in her stomach where they learn all about how the digestive system works.
Explores the way the human body works, the origins of human beings, and the various ways that humans live and organize themselves socially and culturally.
Diagrams with lift-the-flaps and brief, descriptive text describe the human body, covering the digestive system, breathing, blood, the brain, and the senses.