SUDDENLY, (after thirty years, millions of dollars, thousands of scientists) in September, 2015, three labs, directed by Kip Thorne, Barry Barish and - lo and behold - Rai Weiss, detected one, an actual gravitational wave.  

 

     This is one of the two most EPIC discoveries in Physics in the last 100 years.  (Higgs Boson Discovery being the other.)