Smolin and Unger are preparing a book titled Can the Laws of Nature Evolve? What are in effect skeleton chapters of the book IMHO are available here. I don't know which chapters so I will call them A and B. Chapter A: http://pirsa.org/08100049/ Chapter B: http://pirsa.org/08090050/ The first of these would be the general theory of physics law evolution and the second would be the special case where the ideas are applied to landscape theories, making them testable. In each case you can go there and click where it says PDF and download the slides to the talk so you can study. The book will have a major effect IMHO and is worth thinking about already. Here are direct links to the PDF slides: http://pirsa.org/index.php?p=media&url=/pdf/files/68863c39-f22d-430f-991d-bb8d224440ad.pdf http://pirsa.org/index.php?p=media&url=/pdf/files/9218e873-97d5-42ba-b1c7-70e498081c43.pdf There are certain main examples to assimilate and get in your head to make the whole thing easy to understand. Here is one. Since Newton, if not earlier, it was a universal law of nature that space geometry was orthodox 3D Euclid. Geometry was a reliable rigid given. After 1915 we realized that geometry evolves. the laws about triangles and stuff are dynamic and in process of evolving. Here is another case. Since Newton, we have the idea of conservation of energy, momentum, angular momentum. But Emmy Noether taught us that those arise from space and time symmetries. So their applicability is contingent on space having expanded enough to approximately even out. The conservation laws are contingent, approximate, and the result of the process mentioned before---the dynamical evolution of spatial geometry noticed in 1915. There are a lot of other cases discussed in the slides. There are 72 slides in the Chapter A set that you download. These examples of physics law that we already know have evolved begin around slide #44 or #45, if you want to look it up.