It’s a poor atom blaster that won’t point both ways.

Of course there are worlds. Millions of them! Every star you see has worlds, and most of those you don't see.

I never considered myself a patriot. I like to think I recognize only humanity as my nation.

I do not use airplanes. They strike me as unsporting. You can have an automobile accident-and survive. You can be on a sinking ship-and survive. You can be in an earthquake, fire, volcanic eruption, tornado, what you will-and survive. But if your plane crashes, you do not survive. And I say the heck with it.

Science is a mechanism, a way of trying to improve your knowledge of nature. It's a system for testing your thoughts against the universe, and seeing whether they match.

He always pictured himself a libertarian, which to my way of thinking means "I want the liberty to grow rich and you can have the liberty to starve". It's easy to believe that no one should depend on society for help when you yourself happen not to need such help.

I do not fear computers. I fear the lack of them.