When you know the answer you want, it is often all too easy to figure out a way of getting it.

Experimental evidence is the final arbiter of right and wrong.

When I give this talk to a physics audience, I remove the quotes from my 'Theorem'.

Our eyes only see the big dimensions, but beyond those there are others that escape detection because they are so small.

I wouldn't say that The Fabric of the Cosmos is a book on cosmology. Cosmology certainly plays a big part, but the major theme is our ever-evolving understanding of space and time, and what it all means for our sense of reality.

Black holes, we all know, are these regions where if an object falls in, it can't get out, but the puzzle that many struggled with over the decades is, what happens to the information that an object contains when it falls into a black hole. Is it simply lost?

Most scientists like to operate in the context of economy. If you don't need an explanatory principle, don't invoke it.