Providing an introduction to science, this series presents concepts gradually and simply, and backs them up with experiments and activities that are designed to be both straightforward and enjoyable. The illustrated step-by-step projects are accompanied by colour photographs of real places and objects. This book investigates the properties of air and water. The activities include making hot-air spinners, flying a home-made kite, building a water-wheel, and constructing an air-bubble diver.