One of the more laborious scientific enterprises of the last few decades has been the development of gravity wave detectors. These detectors, which are supposed to pick up the tiny ripples in space-time due to events involving massive objects are, themselves, massive. The biggest hang-up is that, despite their enormous size, these things need to be incredibly sensitive, making building one rather challenging.
In an intriguing talk, called "Underground and airborne matter wave inertial sensors: towards fundamental tests of gravitation," Phillipe Bouyer of CNRS d'Optique presented some interesting results and a grand vision for a new type of gravity wave sensor.
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