That was the wonderful thing about Ramanujan. He discovered so much, and yet he left so much more in his garden for other people to discover.

Aviation is the branch of engineering that is least forgiving of mistakes.

The science window gives you a view of the world, and the religion window gives you a totally different view. You can't look at both of them at the same time, but they're both true.

Almost everything about the universe is astounding.

Intelligence may indeed be a benign influence creating isolated groups of philosopher-kings far apart in the heavens... On the other hand, intelligence may be a cancer of purposeless technological exploitation, sweeping across a galaxy as irresistibly as it has swept across our own planet.

We do not know how much of the environmental change is due to human activities and how much [is due] to long-term natural processes over which we have no control.

I think that the artificial-intelligence people are making a lot of noise recently, claiming that artificial intelligence is making huge progress and we're going to be outstripped by the machines. But, in my view, this whole field is based on a misconception. I think the brain is analog, whereas the machines are digital. They really are different. So I think that what the machines can do, of course, is wonderful, but it's not the same as what the brain can do.