Trust me, just keep reading. However, unless you have a decent background in theoretical physics (that is, unless you already understand it), you probably won't really grasp the first couple hundred pages. Awash in Yang-Mills field and Reimann metric tensors, the finer point of the physics and mathematics (and Kaku admits much of the math is beyond him) are lost on me. If you want relativity and quantum theory for the lay audience, I think Hawking's A Brief History of Time is a better bet. But please, read on...
Throughout, Kaku's point becomes clear - the laws of the Universe seem to simplify when expressed in higher dimensions. And where this lands for me is in yet another bit of compelling evidence for the importance exploding the dualism that pervades every aspect of our existence. Lately I see the same things - patterns and syncronicities - in nearly everything I see, read, hear, and feel, and this book is yet another piece of that puzzle. I even found, to my great delight, a physicist's argument for globalization buried deep in these pages.
All I'm saying is that it's all the same thing. I can feel it in my GUT. Everything is everything.