Astronomy leads us to a unique event, a universe which was created out of nothing, and delicately balanced to provide exactly the conditions required to support life. In the absence of an absurdly improbable accident, the observations of modern science seem to suggest an underlying, one might say, supernatural plan.

I think, in general, medicine in the 21st century will switch from healing the sick to upgrading the healthy... If you find ways to repair the memory damaged by Alzheimer's disease or dementia and so forth, it is very likely that the same methods could be used to upgrade the memory of completely healthy people.

I had fallen in love with a young man... and we were planning to get married. And then he died of subacute bacterial endocarditis... Two years later with the advent of penicillin, he would have been saved. It reinforced in my mind the importance of scientific discovery...

Wherever we look at the living biota … discontinuities are overwhelmingly frequent…The discontinuities are even more striking in the fossil record. New species usually appear in the fossil record suddenly, not connected with their ancestors by a series of intermediates.

But our ways of learning about the world are strongly influenced by the social preconceptions and biased modes of thinking that each scientist must apply to any problem. The stereotype of a fully rational and objective scientific method, with individual scientists as logical (and interchangeable) robots, is self-serving mythology.

Q: What were you thinking when your colleagues were out there making cosmic history? A: I just kept reminding myself that every single component in this spacecraft was provided by the guy who submitted the cheapest tender.