I've finished General Physics w/Calculus I and II, but would like to continue learning more on the side. I've been re-reading the mechanics portion of my text, and plan to re-read the E&M sections after I take Multivariate Calculus this fall (we used Fundamentals of Physics 8th Edition - Halliday/Resnick/Walker). My question is, "Where do I go from here?". I've already taken Linear Algebra, and will be taking Differential Equations in the spring. Is there additional mathematics people might recommend? I picked up "Numerical Methods for Scientists and Engineers" by R.W. Hamming. Is this a good read? I will be taking versions of Thermodynamics and Fluid Mechanics for my major which is taught in the Engineering department, so that might give me some satisfaction in those areas. I've also picked up the supplemental chapters for my Physics book which amount to being a good teaser for Relativity, Quantum Mechanics, Matter Waves, and Nuclear Physics. I also picked up "Quantum Theory" by David Bohm which looks like a semi-substantial read. Where should I go from here? What area of Physics should I delve into after I feel very comfortable with my text from General Physics I & II?