Hi. I'm an advanced undergrad in Physics but I am interested in reading something about modern algebra and possibly, modern math research, in my free time. I'm looking for something that will be informal enough that I can read it easily and not get bored but also with enough detail to represent the subjects. (A lot of actual math in it would be okay with me, as long as the written text is good enough.) Does anyone have any suggestions of a book like this? -Thanks!