Hi there, I became really serious studying the basic principles of physics few months ago. There is a plenty of good study material out there, so there was no need to ask anybody anything. Until now. The problem is with the speed of light c and why it has properties and value it has. Few questions which I would like to elaborate: 1. Is there really no theory or framework from which I can derive the value of speed of light without knowing in advance what its value should be nor by measuring it directly? Basically I'm looking for an equation where c is the only unknown and when I add all values right into it I get the correct value of c (no tautologies please :) 2. The basic principle of the Special relativity is that all observers perceive a light wave move at c regardless of their relative speeds to each other and to the light source. So it must be true that if you reverse it, relative to a light wave all (matter) objects move with one speed the c. For a light wave this would be as real as it gets. If matter moves at c, it's mass becomes infinite and time in the matter world stops for the observer (it essentially becomes a singularity. I quess that's why there is the fear that LHC will create miniscule black holes by accelerating some particles too close to the speed of light). If this reversal of perspective is true, why the path of light rays we see doesn't act as if any mass object it encounters was a singularity?