I fully expected that, by the end of the century, we would have achieved substantially more than we actually did.

I think we're going to the moon because it's in the nature of the human being to face challenges. It's by the nature of his deep inner soul... we're required to do these things just as salmon swim upstream.

Research is creating new knowledge.

Geologists have a saying - rocks remember.

Science has not yet mastered prophecy. We predict too much for the next year and yet far too little for the next 10.