I&#x27;m am really confused as to how Martin Rees has written such a poor article. He&#x27;s bloody Astronomer Royal. I suspect a ghostwriter.<p>a) Gravitational waves do NOT &quot;shake the mirrors&quot;. They make spacetime contract in orthogonal directions around and within the beam tube (and of course elsewhere) thus causing the light to travel a tiny bit further in the tube, thus causing interference by moving the two beams out of phase.<p>b) As I posted the other day - what about Virgo? What about GEO600? I feel really sorry for the scientists who&#x27;ve spent decades working on this as part of a global collaboration to now have LIGO take <i>all</i> of the credit for this discovery.