Yeah - I visited virgo years ago when they were about to start calibration - it&#x27;s super cool, but then again, I think michelson-morely interferometers are cool as a category. They were invented for a not dissimilar purpose - testing the properties of the luminiferous aether seeing if light and matter moved at different rates depending on the earth&#x27;s motion through the aether. The result was negative, and a patent clerk got thinking.<p>Now his ideas are being put to the test with the same apparatus.<p><i>So</i> cool.