Was watching Star Trek:TMP today and wondered why the transporter could not have been used to save the two crew members after being scrambled by the enterprise's own malfunctioning one...why didn't starfleet simply dump them back into the buffer, and rematerialize them using the last (good) scan of them? Why not take it further and use a transporter for surgery, to reverse aging? bring back the dead? all these things are possible within the context of the show