We didn't know the importance of home computers before the Internet. We had them mostly for fun, then the Internet came along and was enabled by all the PCs out there.

It's not good enough for us to have generations of kids that ... look forward to a better version of a cell phone with a video in it. They need to look forward to exploration.

Science is not about consensus, and consensus is not science.

America was good enough to make a small compact lighter weight nuclear weapon. The Russians still had these big clunky heavy ones, so they had to build the big boosters in the arm's war, so now all of the sudden Russia could take off the shelf and put into orbit much heavier things than we could, so that's why they had the original leadership.

NASA is doing nothing but development. They're not doing research in manned spaceflight at all and I see no reason for them to do that because we already know that it will work and we already know exactly how it will work.

The criticism is, once I get something flying, I lose interest in it.

In 12 or 15 years, there will be routine, affordable space tourism not just in the U.S. but in a lot of countries.