This book is an ideal guide to the most important and, of course, most fascinating questions of modern physics: “Is time travel possible?”, “Do parallel universes exist?”, “If the universe is expanding, then where is it expanding?”, “What will happen if, having accelerated to the speed of light, you look at yourself in the mirror?”, “Why are particle colliders needed, and why should they work constantly? Don’t they repeat the same experiments endlessly?” Humor, paradox, fascination and accessibility of presentation put this book on the same shelf as the bestsellers of Ya. Perelman, S. Hawking, B. Bryson and B. Green. A real gift for everyone who is interested in modern science - from an inquisitive high school student to his favorite teacher , from a philology student to a doctor of physical and mathematical sciences.