The next book by Ya. I. Perelman brought to your attention contains paradoxes, tasks, experiments, intricate questions and stories from the field of physics, related to the range of everyday phenomena or taken from well-known works of science fiction. The task of the book is not so much to inform the reader of new knowledge, but to help him revive the existing knowledge, to excite the activity of the scientific imagination. Habitual things, familiar phenomena are shown from a new, unexpected side. Paradoxes incite curiosity. The provisions of science are illustrated by examples from everyday life, from fiction, from the world of modern technology to the author. Understand common prejudices. Striking comparisons, experiments, games, tricks are used. Fun and curiosity are at the service of learning.The book is intended for high school students and self-educators.