I'm a professional scientists working on the physics of naturally occurring plasmas. Here's my blog on science-related books. It includes textbooks, popular science books and memoirs and biographies of or by scientists. Enjoy!
I had to start over from the beginning but I still think it's an excellent book. Up to this point it's also fairly easy, requiring only A-level maths. It's going to get harder shortly when we progress from one to two dimensional problems, I expect.