The Standard Model of physics is the cornerstone of much of modern physics, but the model cannot currently explain everything. It is not necessarily wrong so much as it is incomplete. First, it lacks the unification of the four interactions in nature that we would expect from a complete theory. Gravity is the troublesome stepchild in this scenario. The concept of antimatter is also an area where the Standard Model fails us along with the masses of particles, the symmetry of the three generations of particles, the existence of dark matter and energy, and ultimately, a grand unified theory. The following pages summarizes the major deficiencies of the Standard Model.