For any speculation which does not at first glance look crazy, there is no hope.

The pain of childbirth is not remembered. It's the child that's remembered.

Computer models of the climate....[are] a very dubious business if you don't have good inputs.

Nothing is boring if you look at carefully.

The purpose of thinking about the future is not to predict it but to raise people's hopes.

If it should turn out that the whole of physical reality can be described by a finite set of equations, I would be disappointed, I would feel that the Creator had been uncharacteristically lacking in imagination.

All the time worrying about pushing the children and getting them to be mathematically literate and all that stuff. It's terribly hard on the kids. It's also hard on the teachers. And I think it's totally useless.