I can't think of a more complete overview of modern physics, if one wished to obtain such an overview from a single book.  Certainly, Roger Penrose is well qualified to produce such a book.  It will take quite some time, I think, to make the most of the depth of information here.  As for the math? Well, that is the language of physics, and one must try to follow even the mathematical arguments as best one can.<br><br>My only criticism, which I guess is more on the order of a suggestion, is that this volume may have served better if presented in three more easily digested volumes.  First of these might be an overview of the nature of physical laws and introducing the math one needs to express and use these.  The second could build on that with a review and presentation of classical physics, while the third would go on to review modern theoretical physics, including quantum theory, string and membrane theory,  dark energy and dark matter, etc.  A review of the possibilities that emerge for a theory of everything might also then be included in a third volume.<br><br>Having said all of the above, the volume, as presented, does indeed belong on my bookshelf; however difficult transfer from shelf to brain may be.<br><br>Robert