whose frame is "right"? i have been reading The Elegant Universe and i have learned quite a bit. however, i dont understand how person A can say that they are still while B is the one who is moving and vice versa. I guess i understand how each person can say they are "still," but i dont understand what would happen to time for each person. for example: if A says B is moving, B's clock would be moving slower. But the same can apply B to A at the same time!