I was reading about the latest black hole merger discovered by LIGO. https://www.ligo.caltech.edu/news/ligo20170601 The article states that the deflection of the arms over 4km was 1×10^-18 meters for an event 3 billion light years (ly) away. If I assume that gravitational waves follow the inverse square law, then at 1 ly the deflection would be 9 meters over the same 4km. More importantly to me, it would be about 4mm over my 1.8 meter height. I would think that would be highly unpleasant! Worse, at 0.1 ly the effect would be 100 times greater so I would stretch 0.4 meters. Not going to survive that! So, is my math correct?