Instinct tells us that our world is three-dimensional. Based on this idea, scientific hypotheses were built for centuries. According to the outstanding physicist Michio Kaku, this is the same kind of prejudice as the ancient Egyptians’ belief that the Earth was flat. The book is devoted to hyperspace theory. The idea of multidimensional space aroused skepticism and ridicule, but is now accepted by many authoritative scientists. The significance of this theory is that it is capable of uniting all known physical phenomena into a simple framework and leading scientists to the so-called theory of everything. However, there is almost no serious and accessible literature for non-specialists. Michio Kaku fills this gap, explaining from a scientific point of view the origin of the Earth, the existence of parallel universes, time travel, and many other phenomena that seem fantastical.