"Space can vibrate, space can fluctuate, space can be quantum mechanical, but what the devil is it? A..." — Leonard Susskind

The success of ordinary cosmology speaks against the idea that the universe was created in a random fluctuation.

Why is there space rather than no space? Why is space three-dimensional? Why is space big? We have a lot of room to move around in. How come it's not tiny? We have no consensus about these things. We're still exploring them.

Unforeseen surprises are the rule in science, not the exception. Remember: Stuff happens.

I have a funny mental framework when I do physics. I create an imaginary audience in my head to explain things to - it is part of the way I think. For me, teaching and explaining, even to my imaginary audience, is part of the process.