Questions and answers provide bite-sized facts about the many features of human body and how they work. Includes activity and glossary.

How does my body work? -- What is a nerve? -- How many bones do I have? -- How do muscles work? -- Why can't I see in the dark? -- Why does my stomach rumble? -- How do I breathe? -- What happens when my heart beats? -- What are scabs made of? -- Why do I sweat? -- How does my body fight germs? -- What are hormones? -- Activity : make a stethoscope.