He has submitted a paper to Nature, and could jeopardize publication in the journal if he talks to the news media about it. Scientists say Wang's experiment creates a pulse of laser light that appears to move faster than c. Think of a wave moving along a rope. The peak of the wave seems to leap forward, traveling through a chamber even faster than light. In the experiment, the pulse appears to exit the chamber a few nanoseconds before it got all the way in.
Different scientists interpret what happened in different ways.
Steinberg explains that the pulse isn't moving through the chamber per se. It's more that the experiment causes the pulse to disappear - and reproduce itself somewhere else. The simple pulse doesn't contain any kind of structure that could be used to send information, said Steinberg. So again, Einstein's theory appears to be intact. The Italian experiment, led by Anedio Ranfagni of the Italian National Research Council, relied on a very different technique.