To all you skeptics, read Anna V's comment. I can imagine slightly whacky but determined to probe our fundamental knowledge researchers trying to do legitimate research on this topic. Like just about all our physics, Maxwell's equations show absolutely no preference for time direction, so advanced wave solutions where $t\mapsto-t$ are just as legitimate. We always impose causality on Maxwell's equations by throwing away the advanced wave. I'll admit the word "magic" does not bode well, but I have heard it used in the same sense as "black box", "characterized by input/output transformation" ... –  WetSavannaAnimal aka Rod Vance Oct 10 '13 at 6:43