I was wondering, why are there no books on LQG? For string/M- theory you have "The Elegant Universe", "Hyperspace", "Beyond Einstein", and numerous others. But, for LQG, the closest I may have found (and I'm not even sure about this, since I just got the book, and haven't really started reading it yet) is a book that examines different courses taken in the past to reach a theory of Quantum Gravity (the book is called "Three Roads to Quantum Gravity", and is by Lee Smolin), and LQG is supposed to be one of them. Nevertheless, there is no book (to my knowledge) that is specifically designed to explain Loop Quantum Gravity. Why is that?