This is a book where Science fiction meets reality. When I started the book I thought it'd be way over my head and I'd have to give up reading it. But, as the book went on I was more and more fascinated. Dr. Kaku has the ability to make difficult concepts easy and relate the past to the present to the future. It is just amazing to see from this book, how what was in the realm of science fiction is now part of science and proven to be authentic. I cannot wait for this scientist/author's next book.