An authoritative but fun-packed series of simple experiments and projects that explain scientific facts and principles. With easy-to-follow instructions and step-by-step photography, the projects are ideal for home or the classroom, and will give children a practical appreciation of the wonders of the world. This fantastic book explains what makes modern-day marvels such as skyscrapers, bridges and dams possible. Each concept is demonstrated by a fun-filled project: build your own waterwheel to learn about wind and water power, discover the principle of photography by creating a working camera, or make your own compass to learn about the Earth's natural magnetism.