This is a comprehensive science reference book covering key topics from gravity, flight and floating to genes and DNA, with clearly written explanations and superb photographs and illustrations. It includes the latest technology links in the form of QR codes for each topic that provide instant access via a mobile phone or tablet to over 180 video clips of experiments, animals in their habitats and animated lessons that enhance the information in the book. It also features Internet links to an additional 1000 recommended websites for further study and homework help via the Usborne Quicklinks website. With a glossary of 1,500 scientific terms, as well as key dates and biographies of scientists and inventors, and 140 simple experiments for young scientists (children) to try at home. This is an exciting reference book that will stimulate children's curiosity and inspire the scientists of the future.