You have to know the past to understand the present.

We are the product of 4.5 billion years of fortuitous, slow biological evolution. There is no reason to think that the evolutionary process has stopped. Man is a transitional animal. He is not the climax of creation.

Somewhere, something incredible is waiting to be known.

It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.

Science is a way of thinking much more than it is a body of knowledge.

Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgment, the manner in which information is collected and used