Hi. I have a couple questions about relativity. I hear that nothing can exceed the speed of light, but then I hear that all motion is relative. When one beam of light goes past another beam of light going in the opposite direction, aren't they moving at 2c with respect to each other? And if I shine a flashlight and walk in the opposite direction, aren't I traveling over c relative to the light? And when any light occurs at all, isn't everything else travelling at the speed of light relative to it? If this is not correct, does relativity mean that nothing can travel faster than light from any one reference frame's point of view? How do you determine what an object's speed is? What is the ultimate reference frame for something's speed to be "relative to" because everything in the universe is travelling at c compared to something else??? Thanks to anyone who can help!