i didn't really directly critize you.. I'm sorry if i made you feel that way..
Now, according to Einstein's second postulate in special relativity, light is a CONSTANT.. that means, if you prove either light goes slower or faster will disprove his theory.. If light goes any slower than the speed of light, it will cease to exist..
Now, another hurdle any new theory has to overcome.. It is the mountains of evidence that relavity works.. the speed of light is constant? well, that works, that explains pretty well what it meant to explain.. the first rule of breaking a old theory is that your theory HAS to break down to the old one in identical conditions.. This new slowing down the light thing doesn't explain exactly how it does that..
Another thing i noticed, there seem to be general confusion as whether light have mass.. Well, light absolutely has no mass.. In order to travel at the speed of light, any object with any mass whatsoever will need infinite amount of energy to travel at 100% speed of light.. As proven by propelling an electron to 99.999999% of speed of light, every addition of 9 at the end requires immense energy increase.. Also it's indisputed by the special relavity equations..
I don't argue for the sake of arguing, i argue for the truth
If you don't argue for your believes, no one will..