The Ultimate handbook of the Marvel Universe was an encyclopedia of characters that had appeared in Marvel comics. In addition to giving a brief description of a character and their appearances, it would try to explain how their powers worked.<br>Most of their teleporters are described as having access to a giant source of energy that they can add to or draw from as needed. HOWEVER, most of them have no conscious control of doing so.<br><br>I read a couple of excellent sci-fi books that had some people who could teleport, and in fact were the backbone of interstellar trade, where they DID have conscious control of that. In fact, the hard part of their training was learning to dump all of your momentum into that pool and then take back what you needed to match speed and direction with your destination.<br>And yes, the book did handle the logical implication of that power: a teleporter can take any object he might happen to be carrying (like a nickel) and teleport it to exactly where it was but now with a velocity of several thousand miles-per-hour, so a teleporter is essentially NEVER unarmed.<br>(The Journeys of McGill Feighan by Kevin O'Donnell Jr, for the curious. And I have just learned there were 4 books, not 2, so I know what I'm reading next.)