Well, it depends on what you mean by those terms.
Time Travel: If you mean travelling back in time, then it's not so much of a stance as a scientific fact. It is theoretically possible to skip forward in time using wormholes, or time dilation.
Teleportation: If you mean the kind where you step into a booth, disappear, then reappear in another booth kind of thing, then no. Again, wormholes might make achieving the same end a possibility. It is generally accepted that you can make a wormhole from one place to another, but there is a lot of debate as to whether such a wormhole would be traversible.
Bringing the dead back to life is kind of ambiguous. It's always possible to bring someone back to life if they've only been clinically dead for a few minutes. Anything longer than that, and you get brain damage, and ultimately, brain death. If you're asking if I believe in a soul or anything, then no, I do not. If you're talking about the thing they did in Mass Effect 2, then I'm unsure.
Time Travel: If you mean travelling back in time, then it's not so much of a stance as a scientific fact. It is theoretically possible to skip forward in time using wormholes, or time dilation.
Teleportation: If you mean the kind where you step into a booth, disappear, then reappear in another booth kind of thing, then no. Again, wormholes might make achieving the same end a possibility. It is generally accepted that you can make a wormhole from one place to another, but there is a lot of debate as to whether such a wormhole would be traversible.
Bringing the dead back to life is kind of ambiguous. It's always possible to bring someone back to life if they've only been clinically dead for a few minutes. Anything longer than that, and you get brain damage, and ultimately, brain death. If you're asking if I believe in a soul or anything, then no, I do not. If you're talking about the thing they did in Mass Effect 2, then I'm unsure.