Most people have heard of the game “Six Degrees of Kevin Bacon.” The premise is simple: You try to find how many connections you are away from the popular movie star, Kevin Bacon. You may not know him directly (most of us don’t), but you may know someone, who knows someone, who knows someone, who knows someone, who knows someone, who knows Kevin Bacon. This is what is meant by “six degrees of separation” --- you are connected to any other person on the planet by no more than six people. This phenomenon persists for almost anybody, and is a principle foundation of network theory.