The book offered to the attention of readers is a philosophical autobiography of Karl Raymund Popper (1902–1994), the greatest philosopher of science and social thinker of the 20th century. The author's narrative about the peculiarities of his intellectual formation and philosophical evolution unfolds against the backdrop of large-scale events of the 20th century - the First World War, the interwar hard times of 1920–1930, forced emigration and years of wandering. The author opens for the reader the entrance to the laboratory of his thoughts, shows the birth of his main philosophical concepts and ideas through the prism of disputes with colleagues, friends and opponents. The book is intended for a wide range of readers.