Read about this experiment and the results obtained: http://www.physorg.com/news/2011-07-gyroscope-unexplained-due-inertia.html What's going on here? Why is the laser gyro accelerating? If this effect proves to be reproducible, would it not indicate the violability of the so-called Equivalence Principle? How can this be possible? Is this the inverse of the Unruh effect? Could it enable propellantless propulsion?