A mustache really defines your face. My dad had a mustache when I was growing up and I can still remember when he shaved it he looked like a completely different person.

The quality that defines us as Americans is the courage to respond to being hit. The courage to root out and destroy the killers. And most importantly the courage to hold on to our values and protect our hard-won freedoms while doing it.

There's only one requirement of any of us and that is to be courageous. Because courage as you might know defines all other human behavior. And I believe - because I've done a little of this myself - pretending to be courageous is just as good as the real thing.

I've had some movies that have been ridiculed but that's OK with me. I don't feel that really defines me. Should I change who I am to be popular?

Athletic competition clearly defines the unique power of our attitude.

Science is one of a handful of things that defines us as a very special species. It is amazing how far we have been able to get and how accurate our predictions are. I think understanding how the universe was born is very important. It really gives us a perspective on many things.