Before I begin this thread, I will go ahead and tell you I do not have much experience in the field of physics. However in the past month I have done some independent studies in the field. But back to the topic... Aristotle long ago said "The only thing I know for sure, is that I truly know nothing at all", but how much of this is true? Personally I live life by this quote but does anyone have a PHD in any branch in physics? Or do we have a theoretical physicist( employed )? If so, what is their that physicist do not understand in physics today? This will come as an opinion but if someone could provide an answer it would really truly help me out. Not a philosophical question here. Is their a specific part we do not know much about? Not looking for a philosophical answer either. Also, I have read fusion energy is soon to be active. I predict this will bring the need for physicists up. Does anyone have information on this? Thanks!