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Philosophy was once considered science.

The scientists often have more unfettered imaginations than current philosophers do. Relativity theory came as a complete surprise to philosophers, and so did quantum mechanics, and so did other things.

I've always been fascinated by quantum physics and the possibility of alternate realities.

I'm not sure what theory is, unless it's the pursuit of fundamental questions.

I had some hesitations about philosophy because, if you worked out a philosophical theory, it was hard to know whether you were going to be able to prove it or whether other theories had just as good a claim on belief.

Physics has a history of synthesizing many phenomena into a few theories.

If I want to understand the laws of physics I have to first believe what I read about physics. I have to have faith in what I read.

To me, what makes physics physics is that experiment is intimately connected to theory. It's one whole.

I've always been fascinated by physics and cosmology. It gets more and more scary the older you get.