This question has not rendered any respons at all in the forum for Astronomy & Cosmology. Maybe it is more relevant in this forum? My question is: Would not a change of the speed of light (or rather; the speed that not light or gravity or any other fenomena can exceed), change the speed of all chemical reactions also? Would it not change every aspect of the universe? And would not that universal change "even out" the change of the speed of light so that we will never be able to notice it? If eg an increased speed of light also makes clocks tick faster (or makes the space expand a bit?), then we may still measure the speed of light to be 299 792 458 m/. In other words, do we not chase our own tail here?