How is energy created? How does it work? How do we measure it? Find out with Eyewitness Energy and learn all about the ways that we power our world. From muscle energy and photosynthesis to fossil fuels, discover ways energy is created naturally and by using scientific machinery. Eyewitness reference books are now more interactive and colourful, with new infographics, statistics, facts and timelines, plus a giant pull-out wall chart, so you'll be an expert on energy in no time. Great for projects or just for fun, learn everything you need to know about energy with Eyewitness.