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I think the researchers at Hong Kong University of Science and Technology may be wrong. I recall reading in ScienceDaily of an experiment in which, under special conditions, a "packet" of light arrived at one end of the test device before it was released on the other side. Of course we're talking nano or pico level but there are speed limits only in Einsteinian space-time. Einstein refined our Newtonian space, why can't his be refined?