"Investigation of human abilities and their development" is an outstanding work of the scientist Francis Galton, in which the author examines the psychological aspects of human nature. The book explores various human abilities such as intelligence, speed of thought, creativity and many others. Galton reasonedly examines how these abilities develop in a person during his life, and how they are interconnected with genetics and environment. This book leaves the reader with a deep understanding of how a person develops in various aspects of their existence and what influences their abilities.