In Britain, like most of the developed world, stem-cell research is regarded as a great opportunity. America will be left behind if it doesn't change policy.

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

The Simpsons is the best thing on American television.

Disorder increases with time because we measure time in the direction in which disorder increases.

The progress of the human race in understanding the universe has established a small corner of order in an increasingly disordered universe.

Disability need not be an obstacle to success.

It is said that there's no such thing as a free lunch. But the universe is the ultimate free lunch.