I have brought up LIGO, the project to detect and observe gravity waves, a number of times mostly in connection with seismic vibration isolation, which is a problem that required a great many years to solve to be able to make the experiment sensitive enough to observe gravity waves which have amplitudes on the order of the diameter of an atom. By the way, LIGO detected its first gravity wave last year. You can follow the LIGO discussions on the thread titled something like, Do equipment stands affect the audio signal?" Started by Agear the OP some months back.
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