Most sets of values would give rise to universes that, although they might be very beautiful, would contain no one able to wonder at that beauty.

There could be whole antiworlds and antipeople made out of antiparticles. However, if you ever meet your antiself, don't shake hands! You would both vanish in a great flash of light.

What was God doing before the divine creation?

When the going gets tough, the tough take a coffee break.

Look up at the stars, not down at your feet.

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.

Life would be tragic if it weren't funny.