The starting point is the child and the questions they ask about how things work, from how to build a house to what powers a rocket to reach the moon. The title is organized around key questions: What's it made from? How's it made? What makes things go? What makes things move? What are sound and light? How do we keep in touch? How big or small? Who does what? There are things to do both on and off the page, including games, recipes and craft activities.