Science fiction is the very literature of change.

I don't think the scientific method and the science fictional method are really analogous. The thing about them is that neither is really practiced very much, at least not consciously. But the fact that they are methodical does relate them.

I was thinking of writing a little foreword saying that history is, after all, based on people's recollections, which change with time.

The big new development in my life is, when I turned 80, I decided I no longer have to do four pages a day. For me, it's like retiring.

For someone to be taken seriously it was valuable to have the appearance of someone who deserved to be taken seriously.

The future depicted in a good SF story ought to be in fact possible, or at least plausible. That means that the writer should be able to convince the reader (and himself) that the wonders he is describing really can come true... and that gets tricky when you take a good, hard look at the world around you.

What were we doing here? Traveling hundreds or thousands of light-years, to break our hearts?