I have lived with the prospect of an early death for the last 49 years. I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first. I regard the brain as a computer which will stop working when its components fail. There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.

When something is made idiot proof, they will just make better idiots.

The fact that no one understands you doesn't mean you're an artist.

Scientific discovery may not be better than sex, but the satisfaction lasts longer.

[On President Bush's plan to get to Mars in 10 years] Stupid. Robots would do a better job and be much cheaper because you don't have to bring them back.

Science makes God unnecessary.

Why does the universe go to all the bother of existing?