Many have heard of the wonderful Quantum magazine, and those who not only heard but also read it probably remember the funny puzzles from the Quantum for Younger Students section. His long-term presenter A.P. Savin collected the best of them and prepared for this book. These tasks do not require special knowledge, they will bring pleasure to adults who have not forgotten how many "twice two" will be, and to children, including preschool children. Enjoy your meetings with the heroes of our book!