Greene takes the reader to the leading edge of thinking in some of the most exciting areas of theoretical physics. And, importantly, he does not try to blind the reader with whiz-bang declarations or to mislead by giving only one perspective on topics that are highly controversial. Greene explains, in plain English, why scientists are considering some pretty far-out sounding possibilities (other universes!), how these ideas might be tested, and why other scientists are fully opposed to such investigations. Greene makes his perspective clear (that some, not all, of these ideas can fall within the heart of science but that only experimental evidence can really make the case) while giving the reader ample room to come to his or her own conclusions.