I read somewhere that if you detect which slit a particle stream goes through in the double slit experiment that you will no longer get the fringe paterns associated with the double slit experiment. I'm told that as soon as you record the detection of which slit the particles enter you loose the patern. But if you don't record which slit was entered you do get your double slit patern. You can even keep the detecting device on that sends a signal to the recording device, but as long as you don't actually record which slit, you get your fringe patern. So... what if you send your detection signal over a very long distance and back again, perhaps many times, to create a delay between detection and possible recording? For example what if you bounce your detection signal off of a satilite many times so that it takes a whole day to reach the recording device. (assuming no temporary data storage in the satilite, etc). Then you could decide a day later whether to actually record the patern or not. Could this be used to send information back in time so that you could read the future? Perhaps you could send coded messages back in time about the Stock Market... in an automated fashion to avoid any paradoxes you might otherwise encounter about your free will. Or would the detection be considered stored in the data stream? Then the question is how brief of a detection signal is required before it is not considered storage of data?