There are many definitions of genius. For example, Newton believed that genius is the patience of thought concentrated in a certain direction. Goethe believed that the hallmark of genius is the ability of the spirit to recognize what is good for itself. Kant said that genius is the talent for inventing something that cannot be taught. That is, a genius is given the power to discover something unknown. The author of the book is R.K. Balandin tried to give his definition of genius and compose his story about the most famous geniuses of mankind. The principle of classification in the book is simple - personalities are arranged by occupation (universal geniuses are especially highlighted). The author examines the achievements of great creators, first of all, in the spheres of religion, philosophy, art, literature and science, that is, in those areas of the spirit where their creative abilities were most fully manifested. The “Unknown Genius” section is intended to show how many wonderful creators remain nameless and how little we know about them.