Science is a combination of theory and experiment and the two together are how you make progress.

There are many aspects of time we just do not understand. That’s the thing about writing a popular book: You realize the things you understand because for those you can give a really simple explanation. But some things about time I just don’t know how to give simple explanations for, even though I can tell you mathematically what’s going on.

I had this illusion that if I kind of dressed badly that I wouldn't stand out. You know, so I actually went out of my way to not look different to the extent I could.

All the normal matter in the Milky Way disc is denser than the dark matter that surrounds it.

I'm not creating the universe. I'm creating a model of the universe, which may or may not be true.

When it comes to the world around us, is there any choice but to explore?

Science is a combination of theory and experiment and the two together are how you make progress.