I was just checking out an article that talked about scientists who were able to slow light to 38 mph. they went on to say that "einstien said that light could only travel at 3x10^8, but he never said it couldnt go slower!" this seems plainly wrong to me. in my understanding, current theory would be violated if something were able to "cross the threshold" something that could travel the speed of light, or below it, or above it. if a particle were found that traveled faster than the speed of light, theory would still be applicable unless that same particle were able to slow down to lower than the speed of light (if i am incorrect here, please educate me) even when we say "light travels slower through air than through a vacuum" this is essentially because refraction causes the light to travel further, thus making it appear to travel more slowly. so how is this experiment explained? is it the same case as traveling through air?