Let's start off by saying that this book is not for everyone. This is, however, a beautifully written book that should be read by anyone that intends to go into relativity physics.

Professor Thorne wonderfully combined the history development of Black Holes, along with enough ancedotes to satisfy science seekers. There are tons of diagrams, background stories, and enough to keep the reader going.

However, it may be too complex of a book for the layman. It is very hardcore, and may be a little slow for casual readers, with enough details to confuse a reader the first time through.

The book also demonstrates the futuristic predictions and applications of Black Holes, from being a power plant, to wormholes in space. It was easily understood.

Bottom Line: If you're into physics, or have a lot of time, go out and buy this book, because it's worth every penny. This gives a good background history on the slow progress of Black Holes, and includes ancedotes from Hawkings to Landau. It is highly recommended if you want to learn more than just "What is a Black Hole?" As others have suggested, "Gravitation" by Thorne, Wheeler and Misner would be a more complex book if you have the background for it.

The true secrets of universe can only be understood by a deep understanding of highly complicated mathematical and physical concepts. For mere mortals like me, books like these offer a good taste of such pleasures. Kip Thorne, a relativist of very high caliber (coauthor of the classic textbook "Gravitation"), takes the reader through a exciting journey through the history of modern cosmology starting with Einstein's Field Equation.

Unlike most popular physics books dealing with such a topic, he actually spends (relatively) little time dwelling on Einstein's work itself (just a couple of chapters) -- there are several books that deal with relativity itself (I'm talking books for the layperson). Instead he quickly starts talking about the "Legacy" of Einstein's great theory. We are led through drama of 20th century cosmology as different solutions were found for the Field Equations which challenged human reason and intuition, ultimately leading to the great crisis: the black hole.

As the author himself is a very active and very highly respected member of the scientic community, the book is full of very interesting (and sometime illuminating) anecdotes about various luminories (I love the one about his bet with Stephen Hawking about the existence of Cygnus X-1 black hole).

If you are a layperson (as far as modern astrophysics is concerned, probably most are lay people) interested in science in general and astronomy in particular, I'd strongly recommend this book (heck, I'd recommend it for any one who's even mildly curious). This is one of the best books in its field (if not the best) that caters to the lay readers (not unlike Richard Dawkins's "Blind Watch Maker" for evolution).

I thought not. I was wrong. The reason: Kip Thorne. I really enjoyed the reading of this book because it offers the theoretical face of the so-called "Black Holes Mechanics" and a very important and delightful part, the history behind the theorems. The book begins with several chapters dedicated almost exclusively to the bases of the Special Theory of Relativity and the General Theory of Relativity, which describes the gravitation field in almost any place of our universe (if you get the book you will see why I say "almost"). Thereafter, the text covers the most important aspects of stellar implosion, which, in fact, brings Black Holes into existence. Once you are immersed in the very topic of the holes, the author studied profoundly their properties with informative boxes, spacetime diagrams, lots of references about discoveries, people and, the great difference with others books, an outstanding and thorough historical background. By the end, the author presents the most excitement predictions about the future use of Black Holes and the yet ill-understood Quantum Gravity Theory (predictions like backward time travel and wormholes). Finally, Kip Thorne closed the book with an excellent glossary of exotic terms and a list of principal characters that appeared throughout the text. I can say, without any doubt, that this is one of the most illustrative and complete books I have ever read, and in my opinion, is a book that every "Black Hole serious student" might have in his/her shelve. If you are looking for a less technical book, I suggest you "Black Holes: A Traveler's Guide" by Clifford Pickover. Nevertheless, if you want a higher challenge, get the book "Gravitation" by Thorne, Wheeler and Misner.

While Singer's book may provide some useful information about the global warming debate, it's overshadowed by shoddy organization and a weak writing style. The repetition of the same key information makes it appear as if Singer has ample evidence for his claim; however, his three major points appear in the foreword. Don't waste your time reading the whole book!

There is little to argue about on this issue when the simple facts already exist. Millions of scientists across the world run hundreds of thousands of tests to examine the man's effect on global warming. Most of this collection is unnecessary, however, as the idea behind man-made global warming is simple enough for anyone to understand. The carbon cycle is the process required for attaining a safe equilibrium inside any water-based planet's atmosphere. Carbon dioxide is a natural heating agent which is periodically absorbed into water (the ocean) and later released back into the air. A certain amount of carbon dioxide should exist in both mediums, however this amount must remain relitivly undisturbed for an equilibium to exist. If humans constantly pour carbon dioxide into the air from burning fossil fuels, then the equilibrium will shut down, with the water absorbing as much carbon dioxide as possible and the air being overloaded, heating things up quite a bit. Many scientists believe this is what happened to Venus, a planet with an atmosphere overloaded with carbon dioxide.

Dr. Singer presents an excellent review of the problems associated with determining the future extent of global warming. He emphasizes the differences between land , ocean, and atmospheric temperature measurements. He also points out correctly that all forecasts depend on models and as we all know weather forecasting is far from an exact science even for the short time of a week or a few months. We still don't know, for instance, if we'll have good snow for the Olympics in Salt Lake City and they are only less than half a year away. How can we have the audacity to pretend to know what the temperature is going to be a hundred years from now? Models can only give answers based on information which is currently available but that is bound to change even within a decade. To engage in massive government intervention on basis of a perceived threat, which in turn rests on inadequate data, would qualify for inclusion in Tuchman's "March of Folly." Dr. Singer is to be congratulated for having had the courage to go against public pressures and present the facts as they exist.