"I don't think I'm a very good teacher. I just try to explain things clearly."

"I don't believe in the idea of a 'common man' or a 'common woman.' I believe in individual people."

"I think that when you're doing science, you're trying to find out something that nobody knows."

"I don't like to be called a genius. I just like to think."

"I would rather have questions that can't be answered than answers that can't be questioned."