I am becoming a secondary math teacher, and have completed Calculus III, and proofs. Within about a year to a year and a half, I will have combinatorics, abstract algebra, an advanced course in statistics and probability, Diff EQ, Linear algebra, and a couple of others completed. I have been reading physics books for non-physicists like Brian Greene (as an example) for a number of years now. Since however, I now have the mathematical underpinnings to understand physics on a more formal level, that is what I would like to do. I also want to study physics because I enjoyed Calculus III a lot, and don't want to lose track of it. I know where I would like to get in terms of having a command of physics. I don't however, really know where to start. I would like to eventually (emphasis on eventually) understand why Quantum mechanics and relativity don't jive with each other, and then be able to learn some of the physics behind string theory. I don't know if that is realistic for a laymanor not. I would however, like to try...with the full understanding that it ovbiously won't happen overnight. So while I know I could buy a college physics textbook to start with and churn out all of the chapters over a long period of time, I am not sure how profitable that would be to get me where I want to be. So if anyone has any ideas on how I should proceede, then they would be much appreciated. Thanks.