This is a difficult subject to comprehend and the author does not help the reader to make it any easier: He not only confuses the reader but also makes it boring by repetition, innumerable references to; fiction, TV shows and other literature that is not directly related to physics. Although the book is free of physics and mathematics, the author could have spent few chapters to concentrate on the physics of parallel universes in layman's language to make the reader understand the physical principles on which physicists want us to believe in parallel universes. The book is described in six parts related to quantum physics, relativity, cosmology, time and parallel universe, understanding of our universe (with parallel universes) and psychology. The idea of parallel universe was first conceived by Hugh Everett III in 1957; his accounting of the famous double-slit experiment and wave particle duality is that since wave is not real but it is probability wave or quantum wave function that may be associated with two particles (in two universes) and not one particle (in one universe).
The author could have hammered on topics such as Heisenberg's Uncertainty Principle (UP), the Observer Effect (Schrödinger's Cat, Wigner's Friend, EPR Paradox) on split and collapse of quantum wave function, antimatter, black holes (Einstein-Rosen Bridge), invisibility of time, and better explanation of quantum mechanics and theory of relativity (both support the existence of parallel universes) in few short chapters and stay focused on the topic without wandering to fiction or other narratives. This would have helped a reader in understanding the concepts better. It is clear from this observation that the reader is not deprived of anything if he/she chooses not to own this book.
Reference: Parallel Universes by Fred Alan Wolf
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