...things are the way they are in our universe because if they weren't, we wouldn't be here to notice.

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

You should never be surprised by or feel the need to explain why any physical system is in a high entropy state.

I think the relationship between memory and time is a very deep and tricky one, to tell you the truth. I don't consider memory another sense. I do consider memory that which allows us to think that time flows.

My emotional investment is in finding truth. If string theory is wrong, I'd like to have known that yesterday. But if we can show it today or tomorrow, fantastic.

My best teachers were not the ones who knew all the answers, but those who were deeply excited by questions they couldn't answer.

The boldness of asking deep questions may require unforeseen flexibility if we are to accept the answers.