This is where Shadowitz truly shines. Many intermediate texts tack on special relativity as an afterthought. Shadowitz instead shows that . He demonstrates how the magnetic field arises as a relativistic consequence of the electric field in a moving frame. By considering a simple current-carrying wire from the perspective of a moving charge, he shows that length contraction of moving charges produces a net charge density, hence an electric field, which transforms into a magnetic field in the lab frame. This pedagogical gem is worth the price of the book alone.