The concept of consciousness is difficult to grasp, in part because neuroscientists still don't know what it really is-or how it's even possible. Most neuroscientists agree that consciousness must be capable of storing information, and must retrieve and process it. They also agree that it exist in smaller parts, but is rather one whole. MIT professor and theoretical physicist Max Tegmark is steering the conversation in a new direction, describing consciousness as a state of matter. Tegmark calls this new state of matter "perceptronium." he explains perceptronium as a general substance that "feels subjectively self-aware." His ideas suggest a more dynamic relationship between consciousness and other states of matter.