Time travel offends our sense of cause and effect - but maybe the universe doesn't insist on cause and effect.

What SF author or fan isn't interested in human space travel? I've yet to meet one.

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.

Time travel is such a magic concept.

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.