what do you exactly mean by that?
sometimes my english just isn't good enough...
sure i could try to solve that because it is just one sentence:
The MEASUREMENT of the speed of light in a vacuum is constant for all reference frames.
it kind of confused me ....
especially please explain to me how that can be proofed ....
and just for the fun of it:
http://www.sciencedaily.com/releases/2005/08/050831071025.htm
(i didn't read all)
i would accept that speed of light=boundless (as a "constant") - now i confused myself ....