The author of the book, Professor, Doctor of Medical Sciences I.M. Kvetnoy traces a long and difficult path of development of medical knowledge. The origin of immunology, knowledge of the secrets of the brain, discoveries in endocrinology, the emergence of antibiotics, the use of anesthesia and antiseptics, organ transplantation, genetic improvement of a person and, finally, the creation of Humtren - a complex computer program with which human physiological reactions are studied - the main stages of the development of medicine, the importance of which is difficult to overestimate.