What makes a rocket go? Why is the sky blue? What is gravity? How do computers work? This book has all the answers. Arranged thematically, it provides clear explanations which uncover the basic scientific principles behind everyday life. There are hundreds of illustrations, both realistic and cartoon, together with quizzers, experiments and amazing facts, which help to make science fun. Lists, charts, a glossary and an index complete this invaluable children’s reference book.