See attachment for my text's explanation's on the permittivity and permeability of free space, if you want but it's not necessary. Anyway, after reading those explanations of the p & p of free space I'm having a very difficult time understanding why taking the inverse square root of the product of those equals the speed of light. Why? I guess it's one of those impossible brute facts that has no explanation such as why an electron absorbs a photon when it ascends to a higher energy level. In any case, I find that very bizarre. The permeability of free space is related to the current, that is the number of electrons moving and the permittivity is related to Coloumb's constant plus the surface of a sphere. I don't see why those entities when multiplied then square rooted then inversed should equal the speed of light.