What materials are protected by paint? How is glass made? What is a synthetic material? Read 'My World of Science: Materials' to find out! Learn what materials are, where they come from, how people use them, and how materials can be recycled. Each book in the My World of Science series explains science that you see in the world around you and use every day. How does a light bulb work? Why are the soles of your shoes rough? How do you hear sounds? How does a magnet keep your refrigerator door closed? Why do some things sink and other things float? My World of Science has the answers to these questions and more. Each book in the 'My World of Science' series explains science that you see in the world around you and use every day.