Part of a series of practical activity books, that includes simple experiments. Each book introduces a basic science concept through projects that can be carried out at home using everyday items. The book also includes tricks and puzzles, together with toys and models to make. While teaching basic science concepts, it encourages children to try new ideas and find out more. The photographs lead the child through the projects step-by-step. This particular book looks at machines and includes instructions on how to make an Archimedes screw, or learn the principle of how the lever helps you to lift a heavy load. Neil Ardley is the author of The Way Things Work.