If I have questions about the universe on my mind when I go to bed, I can't turn off. I dream equations all night.

Science makes God unnecessary.

Of course it is possible that UFO's really do contain aliens as many people believe, and the government is hushing it up

My expectations were reduced to zero when I was 21. Everything since then has been a bonus.

Maxwell is the physicist's physicist.

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.

Many people do not like the idea that time has a beginning, probably because it smacks of divine intervention.