Teleportation isn't very concerning to me, because it's basically against known physic rules for now on. Theoretically I would be very wary of teleportation, on

Teleportation isn't very concerning to me, because it's basically against known physic rules for now on. Theoretically I would be very wary of teleportation, on a pragmatic level: if I don't own the teleportation process on an extreme level then there's too much risk to be altered in some (maybe dramatic) way. However, there's a variant that sucks my thoughts sometimes: what about transferring a full brain's backup into a valid recipient? Classical application would be life extension: going into a "blank" body/brain (or big enough computer) when mine is too old to carry on. It's still very inconceivable nowadays, but much more attainable than teleportation I think. You can't "switch off" the old brain, copy it, and "switch on" the new one, because that would pose the same questions as teleportation. Neither I wouldn't start a copy process, wait for it to complete, commit suicide and set alive the new body/brain in the same time. The obvious solution would be to find a way to connect two brains (be it an organically or computerized brain), extend the thought in such a way that there would be full redundancy of memories between the two devices, and the switch off the old one. I guess I read too much hard sci-fi :)