Time travel used to be thought of as just science fiction, but Einstein's general theory of relativity allows for the possibility that we could warp space-time so much that you could go off in a rocket and return before you set out.

What I have learned from life is to make the most of what you have got.

What is important is that we have the ability to create.

Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.

If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.

I have so much that I want to do. I hate wasting time.

One cannot really argue with a mathematical theorem.