Also for giggles, Baryogenesis.
We watched a lecture by Alan Guth explaining the ins and outs of his inflation theory (read the criticisms of the theory, they're just as interesting as the theory itself). I have almost no idea what was going on, but somehow I still felt impressed by what he had to say. During his lecture though, I came to two conclusions. One, there is way too much math in physics. Someone should really take care of that. Two, lectures can never have too many charts and illustrations. They really do make things easier to understand, especially if you're not understanding much to begin with.