Can someone provide me with a quasi-mathematical introductory text to quantum field theory ? Ideally, a book that's somewhere between popular science and an introductory freshman physics text. I have a strong background in calculus, having just completed a one-semester equivalent reading of R.Shankar's quantum mechanics, so I'm more than comfortable with the math. Nevertheless, I'm looking for something that won't take me months to complete, and isn't formal or heavy, while still retaining all the conceptual clarity of a more advanced text. Also, I'm looking for similar books on Special and General relativity, Nuclear physics, and Particle physics. Appreciate all the help. Thanks in advance.