Not sure where to put this discussion, so please feel free to move it... Ok, so here I go... I understand why theoretically time travel cannot exist before the moment it was created, cause one fellah would have to take one end of a wormhole on a fast ship and fly about a bit. I understand why the grandfather paradox must be explained by alternate realities, because my grandfather would flatly refuse to share a reality with me for various reasons. I kinda get why "dark matter" is needed to bind spinning galaxies together, or why "dark energy" is needed to hold universes together. I kinda get why seven, or one hundred, or three thousand dimensions that the eye cannot see, might complete a Newtonian/quantum equation that makes other huge assumptions fit together neatly. Don't get me wrong, I can see why identifying "unknowns" is important in order to devise tests to discover them... but, I do not see how a career can be made out of just guessing... however pretty the maths might be... I truly cannot see is how pure guesswork is useful to anyone. To me it is pure alchemy. Is theoretical physics the new pariah?