I believe that the present is already affected by Time Travel, if it existed. Like say, some guy goes back in time and changes the past, then I think instead of our present instantly changing, I believe the way it is now is the result of someone going back in time already. It's hard to explain... I highly doubt we will ever master Time Travel, although stuff like Hovering, Invisibility, and Teleportation I think could be done, since they actually do have protypical methods of these things. They supposedly are able to teleport a single atom or energy however, they are reluctant to try it with organic things or complex systems. I also have heard stories that through refracting light a certain way, one can become invisible, and also that by gravitating to a large celestial body, levitating things is also possible. Ah the wonders of technology... Aaaaah!!!! The Wonders of technology!
Oh, good Adult Swim quote, Dr. Mario.
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If it is black and white and smells awful, I assure you it''s adorable.