However, in the context of discussing this article, they also used the subheader "faster than the speed of light" for a paragraph describing how the physicists accelerated the mirror... and didn't go faster than the speed of light.
So it's kinda a poorly written article in general :)
The sad thing is that for a lot of magazines and newspapers, the person who writes the article isn't the person who writes the headline or headers.
This often means no matter how good the writers understanding is of the subject, the headers always make the article look retarded. It would be like assigning a 12 year old to subheader Stephen Hawkings next book... the sad thing being the 12 year old would likely do a better job than the 40 year old who does this for their living.
So it's kinda a poorly written article in general :)