I have decided time travel will not work. Lets say you jump one hour into the future. The earth will have moved, as will have the solar system around the galaxy, and for that matter, the galaxy itself. Youd materialize in space.
The same would happen going into the past.
As fun as it is to engage in thought experiments in which you meet dinosaurs, or Morlocks and Eloi, in reality it cant happen.
As Ive pointed out before, teleportation or those Star Trek transporters, wouldnt work. If you were beamed down on the equator youd end up a red streak since the earth is spinning about 1000 miles an hour.
It appears this space-time continuum stuff prevents us from teleportation or time travel. Its too bad.
Still, theres always those Stargates. I hope they work.