I have hardly ever known a mathematician who was able to reason.

I don't think the human race will survive the next thousand years, unless we spread into space.

Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.

With genetic engineering, we will be able to increase the complexity of our DNA, and improve the human race. But it will be a slow process, because one will have to wait about 18 years to see the effect of changes to the genetic code.

If I had a time machine, I'd visit Marilyn Monroe in her prime or drop in on Galileo as he turned his telescope to the heavens.

I was not a good student. I did not spend much time at college; I was too busy enjoying myself.