Science is the process of crash testing ideas: you ram the idea head-on into a brick wall at 60mph, and knowledge is gained by examining the pieces. If the theory is solid, the pieces are from the wall. Then we build a bigger wall.

I come from a long line of saloon keepers and proselytizers, and I draw from both sides.

We're fighting an enemy that is far different than any we have got before. It's a nontraditional kind of war, and I think we need to step back, recalibrate how we go about protecting our borders and protecting our people, and resetting our position in the world.

It's taken a lot of presidents to get us where we are today, a lot of deployments, a lot of wars, a lot engagements. You add them all up.

I love music, I love all kinds of music, particularly jazz. Jazz is an extension of America. There's no other country in the world that could have produced jazz.

In any walk of life, a positive, upbeat outlook trumps any adversarial act. Revenge is counterproductive. Unproductive emotions limit one's ability to move forward, to focus, to think positively, to act creatively.

This is a time when the United States should be standing tall. There is no other leader in the world today. We shouldn't be approaching conflicts as a team sport. We either get in an we lead and we do a good job, or you don't get in at all.