The interest of young people in the achievements of modern physics is well known. And this is quite understandable, since physics is now in the foreground of the scientific and technological revolution. The compiler and title editor showed good taste in the selection of articles on topical topics. The authors of the collection are authorities in their field. Therefore, each article is not a compilation, so often published in popular science publications, but a completely original presentation of a number of physical problems, to the solution of which the authors themselves made a major contribution. The articles in an extremely concise form not only set out the data already obtained by scientists, but also formulated unresolved issues to which the attention of readers was drawn.