Below we excerpt a brilliant essay by Alex Byrne summarizing his argument that our personal survival is grossly over-valued. But, this should not give future teleportation engineers chance to pause. Alex Byrne is a professor of philosophy at MIT.

[div class=attrib]From the Boston Review:[end-div]

Star Trek–style teleportation may one day become a reality. You step into the transporter, which instantly scans your body and brain, vaporizing them in the process. The information is transmitted to Mars, where it is used by the receiving station to reconstitute your body and brain exactly as they were on Earth. You then step out of the receiving station, slightly dizzy, but pleased to arrive on Mars in a few minutes, as opposed to the year it takes by old-fashioned spacecraft.

But wait. Do you really step out of the receiving station on Mars? Someone just like you steps out, someone who apparently remembers stepping into the transporter on Earth a few minutes before. But perhaps this person is merely your replica—a kind of clone or copy. That would not make this person you: in Las Vegas there is a replica of the Eiffel Tower, but the Eiffel Tower is in Paris, not in Las Vegas. If the Eiffel Tower were vaporized and a replica instantly erected in Las Vegas, the Eiffel Tower would not have been transported to Las Vegas. It would have ceased to exist. And if teleportation were like that, stepping into the transporter would essentially be a covert way of committing suicide. Troubled by these thoughts, you now realize that “you” have been commuting back and forth to Mars for years . . .

So which is it? You are preoccupied with a question about your survival: Do you survive teleportation to Mars? A lot hangs on the question, and it is not obvious how to answer it. Teleportation is just science fiction, of course; does the urgent fictional question have a counterpart in reality? Indeed it does: Do you, or could you, survive death?

Teeming hordes of humanity adhere to religious doctrines that promise survival after death: perhaps bodily resurrection at the Day of Judgment, reincarnation, or immaterial immortality. For these people, death is not the end.

Some of a more secular persuasion do not disagree. The body of the baseball great Ted Williams lies in a container cooled by liquid nitrogen to -321 degrees Fahrenheit, awaiting the Great Thawing, when he will rise to sign sports memorabilia again. (Williams’s prospects are somewhat compromised because his head has apparently been preserved separately.) For the futurist Ray Kurzweil, hope lies in the possibility that he will be uploaded to new and shiny hardware—as pictures are transferred to Facebook’s servers—leaving his outmoded biological container behind.

Isn’t all this a pipe dream? Why isn’t “uploading” merely a way of producing a perfect Kurzweil-impersonator, rather than the real thing? Cryogenic storage might help if I am still alive when frozen, but what good is it after I am dead? And is the religious line any more plausible? “Earth to earth, ashes to ashes, dust to dust” hardly sounds like the dawn of a new day. Where is—as the Book of Common Prayer has it—the “sure and certain hope of the Resurrection to eternal life”? If a forest fire consumes a house and the luckless family hamster, that’s the end of them, presumably. Why are we any different?

Philosophers have had a good deal of interest to say about these issues, under the unexciting rubric of “personal identity.” Let us begin our tour of some highlights with a more general topic: the survival, or “persistence,” of objects over time.

Physical objects (including plants and animals) typically come into existence at some time, and cease to exist at a later time, or so we normally think. For example, a cottage might come into existence when enough beams and bricks are assembled, and cease to exist a century later, when it is demolished to make room for a McMansion. A mighty oak tree began life as a tiny green shoot, or perhaps an acorn, and will end its existence when it is sawn into planks.

The cottage and the oak survive a variety of vicissitudes throughout their careers. The house survived Hurricane Irene, say. That is, the house existed before Irene and also existed after Irene. We can put this in terms of “identity”: the house existed before Irene and something existed after Irene that was identical to the house.

[div class=attrib]Read the entire essay here.[end-div]