I know the concept of half a Planck length is wrong. But could someone explain exactly why it is wrong. Also could someone tell me what we conclude about the photon that has moved at C in a planck time (for example) Do we conclude that the photon was at A and is now at B after the passing of a planck time unit and that is all? What I mean; is it pointless to say the photon was at some point halfway? as I suspect it is. I eagerly await your response as I am engaged in an debate over this.