I am discounting the reports of UFOs. Why would they appear only to cranks and weirdos?

I would rather be right than rigorous.

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.

One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn't exist.....Without imperfection, neither you nor I would exist

A million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe.

Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.

No one undertakes research in physics with the intention of winning a prize. It is the joy of discovering something no one knew before.