**Perelman, Y.I. Living Mathematics: Mathematical Stories and Puzzles (3rd Edition, 1949)** **Description:** This book by the late Y.I. Perelman is one of the most accessible works in his renowned series dedicated to the intriguing aspects of mathematics. It features a collection of diverse mathematical puzzles, many of which are presented in the form of engaging short stories. To tackle these challenges, readers need only a basic understanding of arithmetic and fundamental geometry. This third edition is published with minimal changes and is aimed at teenagers—students from secondary schools, vocational and railway colleges, as well as youth schools—along with adults seeking thoughtful and entertaining pastimes during their leisure hours.