I have always thought it would be cool to have a time machine. I mean, you could go back in time and fix things that need fixing, go forward in time and see how life turns out, and bring back knowledge from either time continuum to help make the world a better place.
Sure, there are folks out there that say that if you were to do this then you would change the course of events in the world. But these are just theories and any good scientist knows that you have to test a hypothesis in order to validate it.
And while I don’t like tests, I would be glad to volunteer and help in exchange for a great day at the track.