"The more I learn, the more I realize how much I don't know."

"The atom is a tiny planetary system. The electrons revolve around the nucleus just as the planets revolve around the sun."

"We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct."

"Never express yourself more clearly than you are able to think."

"The ultimate goal of science is to understand the universe and our place in it."