The Problem Everyone probably knows of the concepts of teleportation or mind transference. You step into a thing and pop out somewhere else, or you put on a metal helmet, close your eyes, open them, and find yourself in a brand new body (not necessarily organic either!). These may be actually doable. If so, they could revolutionize society.
But there is one little detail that has nagged me on and off the past few years, something that I have occasionally seen discussed in science fiction literature.