The idea of 10 dimensions might sound exciting, but they would cause real problems if you forget where you parked your car.

I've noticed that even people who believe in fate look both ways before crossing the street.

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

My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand.

My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.

Maybe I'm being a bit harsh on philosophers, but they have not been very kind to me... I have been variously called nominalist, an instrumentalist, a positivist, a realist, and several other ists. The technique seems refutation by denigration: If you can attach a label to my approach, you don't have to say what is wrong with it... I am sure that Einstein, Heisenberg and Dirac didn't worry about whether they were realists or instrumentalists.

Why do we remember the past, but not the future?