We'll go back to the moon by not learning anything new.

Testing leads to failure, and failure leads to understanding.

We need affordable space travel to inspire our youth, to let them know that they can experience their dreams, can set significant goals and be in a position to lead all of us to future progress in exploration, discovery and fun. Thanks to the X Prize for the inspiration.

In the coming era of manned space exploration by the private sector, market forces will spur development and yield new, low-cost space technologies. If the history of private aviation is any guide, private development efforts will be safer, too.

I'm not sure about the selling part, but I've always found that the things I've worn on tour have moved over to what people wear every day. Sometimes the things I wore in the beginning before I had money were things I put together.

The main environmental challenge of the 21st century is poverty. When you don't know where your next meal is coming from, it's hard to consider the environment 100 years down the line.

It's either I have to be in the trees or in the ocean, otherwise I lose my mind. I have to get connected with nature, otherwise I don't feel very good. And that's what life's about, feeling good, so nature knows best for me.

But, gentlemen, can any of us say that as a result of such overwhelming sacrifices of money, of men, of ideals, and of civil dignity the sense of security has indeed been attained?