Incontrovertible' is not a scientific word. Nothing is incontrovertible in science.

My own beliefs are that the road to a scientific discovery is seldom direct and that it does not necessarily require great expertise. In fact, I am convinced that often a newcomer to a field has a great advantage because he is ignorant and does not know all the complicated reasons why a particular experiment should not be attempted.

When I was 28 years old, I found myself in Schenectady, New York, where I discovered that it was possible for some people to make a good living as physicists.

Global warming has become a new religion. We frequently hear about the number of scientists who support it. But the number is not important: only whether they are correct is important. We don't really know what the actual effect on the global temperature is. There are better ways to spend the money.

As science-fiction was what I read in college, it was natural that I should be tempted to write it. So I did, and continued to do so, even while I was co-authoring mysteries with my husband Evan.

Acting in more science fiction films would be fine by me. I love doing them.

Symmetries are the playing field on which the physical world works and which determine the rules of the game. The symmetries of nature determine for us things that remain constant, that can't be changed. Those are the guideposts in physics, the quantities like energy and momentum.

I was an aspiring astrophysicist, and that's how I defined myself, not by my skin color. People didn't treat me as someone with science ambitions. They treated me as someone they thought was going to mug them, or who was a shoplifter.