Thirty years ago I was diagnosed with motor neurone disease, and given two and a half years to live. I have always wondered how they could be so precise about the half.

I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.

All that my work has shown is that you don't have to say that the way the universe began was the personal whim of God.

The past, like the future, is indefinite and exists only as a spectrum of possibilities.

We could call order by the name of God, but it would be an impersonal God. There's not much personal about the laws of physics.

To understand recursion, one must first understand recursion.

Not to leave planet Earth would be like castaways on a desert island not trying to escape...Sending humans to other planets ... will shape the future of the human race in ways we don't yet understand, and may determine whether we have any future at all.