The Next Great Invention

I think that the next great invention is the time machine. There are many stories about the time machine. As you know from that, the time machine is humans dream. We can go to the past and future by the time machine. In other words, we can see what happened in the past and will happen in the future. We can also change the history, but some stories say that it's not good to do becasue all history would change. however, if the time machine was invented, I would want to go to the past better than the future becasue I have some past which I want to change. Anyway, I hope the time machine will be invested as soon as possible.