I don't really know, because I don't understand the more advanced work like QED. But http://www.feynmanlectures.caltech.edu/I_toc.html http://www.feynmanlecture

I don't really know, because I don't understand the more advanced work like QED. But http://www.feynmanlectures.caltech.edu/I_toc.html http://www.feynmanlectures.caltech.edu/I_toc.html is one of my favorite books ever.