I admit that I don't yet grasp much of the physics contained in this book.<br><br>A friend of mine has said that Penrose is 'good, but wrong'. I'm not sure, since I don't know the math perfectly.<br><br>Anyway, some of the philosophical questions raised in this book are highly interesting, for those interested in philosophy of mathematics and philosophy of physics.<br><br>This book is more math-intensive than you might expect from the title, although it is not a workbook.<br><br>It appears to be intended for those who know calculus who want a piece of literature to browse through.