Why is the sky blue? (Revised edition.)

This revised edition of DK's science encyclopedia answers children's biggest questions about scientific exploration, covering forces and energy, materials, the human body, the living world, and our planet.

Why does chocolate melt? Where does wind come from? How do we know dinosaurs existed? This fully-updated, fact-packed kids' book, ideal for ages 7-9, answers all kinds of questions children have about how the world works, and some they hadn't thought of! Divided into chapters, it covers all aspects of science, from animals, plants, and the human body to forces and magnets, light, sound, and space. Each page asks a new question, and answers it with clear, simple text alongside amazing pictures, providing engaging information to help kids understand all the basics about biology, chemistry, and physics. DK's Do you know about Science is the ideal science book to spark curiosity and amaze any child interested in the world of scientific discovery.