allright, I'm finishing up my final Gymnasium physics course and the weirdest chapters (QM and Einstein) are at the end. So here is a book-example I don't understand: Lightning strikes at point A and B at the same time (if an outside observer is watching). Between A and B is a train moving at a constant speed in the direction AB. An observer M is sitting right in the middle of the train, ie right in the middle of A and B. The observer measures that he light coming from B reaches him before the light from A. OK this is weird. I thought that that speed of light is always c to whoever the observer is. So since the light from A and B is approaching the dude at the same speed, shouldn't the light from A & B reach him at the same time? If the observer sees the light from B first, this would mean that the observer's relative speed to the light from B is > C.