A simple introduction to essential science concepts, perfect for both children and parents as a dip-in dictionary or to work through subject by subject. With clear definitions of over 350 key terms and concepts, and hundreds of bright illustrations and useful examples, as well as internet links to recommended interactive websites offering science puzzles, games and experiments. Includes a section on 'What is science?', as well information about living things, materials, forces, light, sound and electricity, space, and scientific investigations.