Two out of every five people on Earth today owe their lives to the higher crop outputs that fertilizer has made possible.

It's OK for China to invent cancer drugs that cure patients in the United States. We want them to catch up. But as the leader, we want to keep setting a very, very high standard. We don't want them to catch up because we're slowing down or, even worse, going into reverse.

When I was in college, for the games of that era, I was as hard core as anyone was. I wouldn't say I outgrew it, but you always have to have a finite number of addictions.

Exposure to the reproductions [of Corbis-owned fine art photographs] is likely to increase rather than diminish reverence for the real art and encourage more people to get out to museums and galleries.

The world is not flat, and PCs are not, in the hierarchy of human needs, in the first five rungs.

I want to admit that I am an optimist. Any tough problem, I think it can be solved.

Capitalism has worked very well. Anyone who wants to move to North Korea is welcome.