You will make a difference in the world, but not immediately. Your first obligation is to find something you like doing, because if you like doing it, you'll do it well.

At no time did I intend to, or do I believe that I did put forward false information to the American people.

I really believe that you can. Not only do I think it is a part of public service to help young people find their way, just as professors had helped me find mine, but I've been very involved in K-12 education issues. I started a program back in 1992 called the Center for a New Generation, an afterschool enrichment program.

Most of the people who were responsible for 9/11 are now in custody or have been killed. But there are others, and they plot and they plan, and they hope to pull it off again. And while we have to be right 100 percent of the time, they only have to be right once. So there's no way to overreact to that.

Separation of powers is a problem for foreign policy.

This is not 1968 and the invasion of Czechoslovakia, where Russia can threaten its neighbors, occupy a capital, overthrow a government, and get away with it. Things have changed.

We have our differences with Russia. And some of those differences produce conflict. But by no means is this the Soviet Union. We have far more areas of cooperation with Russia than we have areas of conflict.