I know that I am intelligent, because I know that I know nothing.

To love someone deeply gives you strength. Being loved by someone deeply gives you courage.

Let us permit nature to have her way. She understands her business better than we do.

I am fond of pigs. Dogs look up to us. Cats look down on us. Pigs treat us as equals.

I'm not as famous as Stephen Hawking, but certainly in the U.S., I have a very high profile for a scientist. It is an awesome responsibility, one that I don't shoulder lightly.