I would like to know whether there has been an experimental detection of advanced radiation. I seem to recall reading about such an experiment but I can't find any reference to it on the interwebs so I'm starting to wonder whether I imagined the whole episode. IIRC the experiment was roughly like this:-
Light was sent through a magic crystal (my language not theirs ahem) which, they stated, theory indicates would result in advanced radiation. This is normally not detectable, but by passing the advanced radiation through another such crystal the advanced radiation would, they predict, result in normal radiation. They detected this radiation and surmised that advanced radiation is real.