A fact-packed, beautifully illustrated, all-round introduction to the human body and how it works. Full of extraordinary photographs, detailed diagrams and stunning scans, X-rays and microscope images of the human body. Engaging, friendly text and clear, simple explanations. Experiments and activities show you how to take your own pulse, test your reaction time and fool your brain with optical illusions. Amazing facts and world records, including the world’s tallest man, the oldest person ever and the longest fingernails on record. What is an Usborne Internet-linked book? It is a book that contains descriptions of websites that take you further into the subject in a fun and informative way. You can find links to all the sites listed in this book on the Usborne Quicklinks website. Will the websites go out of date? Websites do change from time to time, so the sites will be regularly reviewed by Usborne researchers, and the links will be updated.