The increase of disorder or entropy with time is one example of what is called an arrow of time, something that distinguishes the past from the future, giving a direction to time.

I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first.

We are all different. There is no such thing as a standard or run-of-the-mill human being, but we share the same human spirit.

We each exist for but a short time, and in that time explore but a small part of the whole universe

"Sooner or later disasters such as an asteroid collision or a nuclear war could wipe us all out, But once we spread out into space and establish independent colonies, our future should be safe."

Scientists have become the bearers of the torch of discovery in our quest for knowledge.

Not to leave planet Earth would be like castaways on a desert island not trying to escape...Sending humans to other planets ... will shape the future of the human race in ways we don't yet understand, and may determine whether we have any future at all.