The older we get the less afraid we are.

As I've mentioned, a large part of my father's legacy is the lesson he taught his sons. He brought us together and said, 'The measure of a man is how well he provides for his children.

So much of life, it seems to me, is determined by pure randomness.

Far as I can tell, I still have most of my hair, my gut is not hanging over my belt, and I still have all of my teeth.

I want my great-granddaughter to have a fairly good understanding of the world in which I lived for 81 years and also the world before I came into it - all the way back a hundred thousand years, to the beginning of our species.

To be compared to Jackie Robinson is an enormous compliment, but I don't think it's necessarily deserved.

I cannot be understood in three minutes.