Nice find Trance. Interesting reading.
Actually Einstein was right by saying E=mc^2 .
The higher energy the higher speed is. By introducing ultra cold chamber (heat is an energy as well) scientist have created place for a very fast energy exchange. Cooled down atoms would accept energy from the light beam, so light will loose it's energy. As result the light should travel slower (see Einstein's formula).
This is my understanding only, which is really contradicts to the electrical superconductivity achieved in ultra cold chambers. Ultra conductivity actually suppose to increase electron's speed through a conductor due to resistance reduction.
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