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.

Everything in my life was luck.

You have this world of mathematics, which is very real and which contains all kinds of wonderful stuff. And then we also have the world of nature, which is real, too.

Nothing is boring if you look at carefully.

It's us that's really amazing.

I like people who are working on practical things and who are working in teams. It's not so important to get the glory. It's much more important to get something that works. It's a better way to live.

The universe in some sense must have known that we were coming.