Intelligence is one of the most important characteristics of a person. But what is intelligence? How is it formed? How to most effectively develop it, can it be inherited, is it related to the social environment or is it formed depending on personal qualities? All these interesting questions were resolved in a bright and dynamic book by world famous psychologists Hans Eysenck and Leon Kamin. The book is written in the genre of lively and sometimes fierce polemics, since its authors adhere to almost opposite points of view and sometimes engage in verbal hand-to-hand combat, interpreting the same facts in completely different ways. This style of presentation constantly keeps the reader in suspense, and the development of the course the thoughts of such famous specialists will be of interest to anyone interested in modern psychology and problems of intellectual development.