I used to think information was destroyed in black hole. This was my biggest blunder, or at least my biggest blunder in science.

We think we have solved the mystery of creation. Maybe we should patent the universe and charge everyone royalties for their existence.

Disability can be no handicap.

When I get to heaven I'm gonna find the guy in charge of the weather and kick his rear.

Chaos, when left alone, tends to multiply.

I think the next [21st] century will be the century of complexity. We have already discovered the basic laws that govern matter and understand all the normal situations. We don't know how the laws fit together, and what happens under extreme conditions. But I expect we will find a complete unified theory sometime this century. The is no limit to the complexity that we can build using those basic laws.

Computer viruses are alive.