Describes how the human respiratory system works and discusses such related topics as yawning, hiccuping, and coughing.

Why Do I Laugh or Cry?

by Sharon Cromwell

Published 24 January 1998
Describes how the human nervous system works and discusses such related topics as goose bumps, blushing, and dreaming.

Why Does My Tummy Rumble?

by Sharon Cromwell

Published 24 January 1998
Describes how the human digestive system works and discusses such related topics as vomiting, gas, and stomach aches.

How Do I Know It's Yucky?

by Sharon Cromwell

Published 24 January 1998
Describes how the five human senses work separately and together and discusses such related topics as brain messages, receptor cells, and sound waves.

Why Can't I Fly?

by Sharon Cromwell

Published 24 January 1998
Introduces the human motor system and how it allows the body to move, covering such aspects as bones, muscles, balance, and exercise.