More Time Travel, less serious

Teleportation and time travel are basically the same, so it seems like if you have one you get the other for free.That said, Larry Niven wrote a bunch of stories about a teleportation technology that can't violate the conservation of energy, and the result was that if you teleported off the top of a mountain (for instance) down to the valley, you'd come out of the machine and burst into flames, due to the release of potential energy. Conversely, you'd emerge a frozen block travelling from the valley to the mountain.Come to think of it, they weren't very good stories.Anyway, you raise an interesting point, but I think the problem is best resolved the same way Asimov's Three Laws are best understood - not as good rules about time machines or robots, but good rules about good stories about time machines or robots. The story where they get in the DeLorean and boom - they're in the future, except they're in the middle of space isn't a very good or compelling time travel story.