I completed the book last weekend. It’s not very big – about 400 pages paperback. I can’t really review the physics; and the book isn’t very technical or mathematical. It’s a book for everybody and I think that anybody with two braincells or more should be able to understand it.
Dr. Kaku describes the history of cosmology, and how modern cosmology came to the realization that parallel universes aren’t as unlikely as once thought. In the end, the jury is still out on the issue, but if the topic fascinates you as much as it does me then you will find this book to be a good overview of the argument for parallel worlds. It’s also quite a compelling read; I basically read it in three evenings.
I thoroughly enjoyed reading this book, and thus can recommend it to anybody interested in the topic; however, if you’re a physicist or mathematician you will find this book to be very superficial.