I think those who have a terminal illness and are in great pain should have the right to choose to end their own life, and those that help them should be free from prosecution.

In fact, if one considers the possible constants and laws that could have emerged, the odds against a universe that produced life like ours are immense.

When I hear of Schrödinger's cat, I reach for my pistol.

It should soon be possible dramatically to increase the intelligence and life span of a few individuals. They and their offspring could become a master race. Evolution pays no regard to social justice. It was not fair on the Neanderthals they were replaced by modern humans.

Women. They are a complete mystery.

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

There is no way that we can predict the weather six months ahead beyond giving the seasonal average.