How big? How heavy? How thick? How fast? How much? How often? These are questions that often arise in school and university. Accurate and ideally record-breaking structural and functional data are expected as answers. Additionally, there are often questions about one's own body, health, or societal changes that seek numerical evidence. The proven concept of the 3rd edition has been continued in the completely revised and updated 4th edition, both in content and structure. An introductory text at the beginning of each chapter captivates readers. Overview pages introduce the subject areas. General data is followed by specific information, with structural details leading to figures on physiology and molecular biology. Statistical values provide an overview of diseases, drug problems, and current population trends at the end.