"Sooner or later disasters such as an asteroid collision or a nuclear war could wipe us all out, But once we spread out into space and establish independent colonies, our future should be safe."

Its a crazy world out there. Be curious.

Science can lift people out of poverty and cure disease. That, in turn, will reduce civil unrest.

The universe does not behave according to our pre-conceived ideas. It continues to surprise us.

I have sold more books on physics than Madonna has on sex.

Obviously, because of my disability, I need assistance. But I have always tried to overcome the limitations of my condition and lead as full a life as possible. I have traveled the world, from the Antarctic to zero gravity.

Doing a job RIGHT the first time gets the job done. Doing the job WRONG fourteen times gives you job security.