Discover what machines are, how they work, and how they have developed through history, in this fascinating fact file and learn-it-yourself project book. You can find out about levers, pulleys, wheels and axles, gears, hydraulics, wind power and much more. It includes 19 practical experiments - make a windmill, a hydraulic lifter and even a vacuum cleaner! Over 260 images include step-by-step photographs and explanatory illustrations. It is an accessible and lively introduction to machines, ideal for home or school use for 8- to 12-year-olds. From sophisticated computers to a simple pair of scissors, we are surrounded by machines. This engaging science book looks at the enormous variety of machines in our world and how they function. Fascinating hands-on projects, such as making your own gears and belt drives, a pulley, a block and tackle, a can crusher, a water wheel, and an Archimedean screw, will help you to fully understand the principles behind them. "Find Out About" is a series for young readers who would like to explore the exciting world of science. Each book covers a different topic, bringing the subject to life with vibrant photographs, detailed drawings and clear diagrams, making it really fun to learn. There are easy-to-do experiments using everyday objects and equipment so that young scientists can enjoy finding out all the fantastic facts for themselves.