I'm posting as a music student (composer) who is interested in philosophy, particularly philosophies of time. Recently, I've my interests have tended towards the writings Fraser, Whitehead, Eddington, Russell and the like. I only mention this because responses to my question are only helpful if they assume a very weak mathematical background (like Russell's ABC of Relativity). . . I heard in a lecture recently that at the subatomic level certain particles (I think it might have been electrons and positrons. . . not sure) can interact in such a way that the interaction can be viewed as having happened both in forward and in reverse time, i.e. the "effect" is, or at least appears to be, produced prior to the "cause." I assume this is a generally accepted aspect of quantum theory? If accepted, what is the theory known as? Thanks.