I have faith, as I did when I announced my stem-cell decision in 2001, that science and ethics can coexist.

When you're writing about something that happened, it helps you transition to the present. Ironically enough, by focusing on your presidency, it helps you realize that you're no longer the president. By reliving moments, it helps you stay focused on the moment.

There has been some conditionalities in the sense that this debt relief is supposed to release resources to be devoted to education, healthcare and infrastructure, for example. In the past African government made such promises but they never carried them out.

Our law enforcement must have every tool necessary to find and disrupt terrorists at home and abroad. That's the task of the 21st century.

Concentration of greenhouse gases, especially CO2, have increased substantially since the beginning of the industrial revolution. And the National Academy of Sciences indicates that the increase is due in large part to human activity.

Do I think faith will be an important part of being a good president? Yes, I do.

Listen, I know of nobody -- I don't know of anybody in my administration who leaked classified information. If somebody did leak classified information, I'd like to know it, and we'll take the appropriate action. And this investigation is a good thing.