Women. They are a complete mystery.

If everything in the universe depends upon everything else in a fundamental way, it might be impossible to get close to a full solution by investigating parts of the problem in isolation.

What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.

Science is beautiful when it makes simple explanations of phenomena or connections between different observations.

Life on Earth is at the ever-increasing risk of being wiped out by a disaster, such as sudden global warming, nuclear war, a genetically engineered virus or other dangers. I think the human race has no future if it doesn't go into space. I therefore want to encourage public interest in space.

When I was first diagnosed with ALS, I was given two years to live. Now 45 years later, I am doing pretty well.

There is a real danger that computers will develop intelligence and take over.