The collection of the outstanding domestic popularizer of science and the author of numerous books that develop thinking, Yakov Isidorovich Perelman (1882-1942) includes descriptions of several hundred different tricks, tasks and puzzles, including exciting entertainment with paper, coins and other common objects. The book includes riddles for young physicists, stories about giant numbers, experiments using electrostatics, descriptions of optical illusions, as well as a story about the method of memory development. Provides clues, answers, and solutions. The book is decorated with drawings from the first articles and books of Perelman.