If you could go back in time, what would you do differently? Or, would you prefer to fast forward and see what the world is like in the future?
While time travel does not exist at the moment, it may be possible according to the theory.
Physicist Albert Einstein theorized that time is relative depending on how fast you travel.
For example, the faster you move in space, the slower you move in time.
To a certain extent, astronauts at the International Space Station are already time travelers in that they are doing things at a second in the future.