Time travel is such a magic concept.

Are you saying that we can affect what happened in the past? That we can change it?

When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.

You live for yourself. There is more time for family and friends and the chance to travel. I can take off when I want and I don't need anyone's permission.

It was probably the first time I ever did that. I don't think it was a travel, either. It was real exciting. It gave us some momentum.

Yeah, but what if you went back and killed your own grandfather?"

He stared at me, baffled. "Why the fuck would you do that?