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

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

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

When in doubt, don't.

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.