Is it true? I've heard this news couple years ago: Not for the short distances but during long distance travels light slow downs once in a while. İt sounds logical to me, we shouldn't expect the light will move at the same speed all the times and everywhere. During it's billions of years travel it's speed might drop a little bit every once in a while. I remember this was a british based study but I'm not sure. Anybody knows more about this subject? Thanks in advance.