Sometimes attaining the deepest familiarity with a question is our best substitute for actually having the answer.

We don't know the answer to that question. That's one of the things investigators are looking into, but it would be unwise for us to speculate on that at this time.

We're on this planet for the briefest of moments in cosmic terms, and I want to spend that time thinking about what I consider the deepest questions.

I do feel strongly that string theory is our best hope for making progress at unifying gravity and quantum mechanics.

To every answer you can find a new question

Maybe the answer is that there isn't one. Maybe the answer is that there isn't JUST one.