Originally Posted by HarryT
I remember some years ago either reading a short story, or seeing a short film - I forget which it was - about the "ethics" of transporter technology, the whole point of which was that it inevitably involves the "death" of the person being "transported", and the ethical implications of that.
For some reason (and it may be
a short story I read once), this is what came to my mind too when I first saw it on the list. I don't want to assume that's the basis of BOb's "impossible", but if it is, then it would clarify that particular parameter of "impossible" in my mind.