15th Edition . Edited by prof. A. B. Mlodzeevskiy . -L. : Gostekhizdat, 1949. 270 s. The book is written by a well-known popularizer and educator and contains puzzles, tasks, experiments and stories from the field of physics. The book on the nature of the presentation and the amount of knowledge expected from the reader is designed for secondary school students and for persons engaged in self-education in the same amount . From the Preface to the Thirteenth Edition. Speed. Addition of movements. Weight and weight . Leverage. Pressure. Environment Resistance. Rotation. "Eternal Engines"The Properties of Liquids and Gases. Thermal phenomena. Rays of Light . Reflection and refraction of light. Vision with one and two eyes . Sound and hearing . One hundred questions to the first book of "Entertaining physics"