In recent years, Khovanov homology has been used to prove many difficult thoerems with relative ease. In this talk, we discuss one such result by Jacob Rasmussen, showing that the slice genus of a (p,q) torus knot is (p-1)(q-1)/2. This result is classically known as the Milnor conjecture, and until recently, the only known proof used high-powered techniques from gauge theory.