Science is a way of thinking that helps you not to fool yourself.

Every cell is a triumph of natural selection, and we’re made of trillions of cells. Within us, is a little universe.

Looking at fires when high, by the way, especially through one of those prism kaleidoscopes which image their surroundings, is an extraordinarily moving and beautiful experience.

There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.

The Big Bang is our modern scientific creation myth. It comes from the same human need to solve the cosmological riddle [Where did the universe come from?]

You have to know the past to understand the present.

It will not be we who reach Alpha Centauri, and the other nearby stars. It will be a species very like us - but with more of our strengths and fewer of our weaknesses.