Perelman Yakov Isidorovich (1882-1942) - Russian, Soviet scientist, popularizer of physical and mathematical sciences, founder of the genre of scientific and entertaining literature. One of the first propagandists of the ideas of K. E. Tsiolkovsky. The author of over 100 books ("Entertaining Physics," "Entertaining Algebra," "Interplanetary Travel," etc.), which have been translated into 24 languages ​ ​ of the peoples of the world and published in a total circulation of St. 13 million copies. A crater on the far side of the moon is named after Perelman." This book contains a hundred motley stories from the field of physics, located in a certain system, despite the relaxed external shape. It is intended for those who have only the most basic information from physics or have not yet begun to study it. It is noticeably different, therefore, from another book by the same author - "Entertaining Physics," similar in manner of presentation, but meaning a more knowledgeable reader." Physics at every step" does not seek to replace the school textbook. Its goal is to induce the reader to consciously observe the simplest physical phenomena, to teach them to notice them in the environment, in everyday life, in nature, in technology, imperceptibly accumulating that stock of facts, the systematic study of which is engaged in physical science. Information from the theory is reported only the most elementary and in a very modest volume; the main attention is drawn to facts and experiments. The selection of experiments is such that they can be performed and drawn from them without any devices. Separate pages of the book are devoted to episodes from the history of physics." Author