A theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations.

There is no unique picture of reality.

One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn't exist.....Without imperfection, neither you nor I would exist

Many badly needed goals, like fusion and cancer cure, would be achieved much sooner if we invested more.

We could call order by the name of God, but it would be an impersonal God. There's not much personal about the laws of physics.

The idea of 10 dimensions might sound exciting, but they would cause real problems if you forget where you parked your car.

I think the next century will be the century of complexity.