Physics grapples with the largest questions the universe presents. 'Where did the totality of reality come from?' 'Did time have a beginning?'

The bottom line is that time travel is allowed by the laws of physics.

Free will is the sensation of making a choice. The sensation is real, but the choice seems illusory. Laws of physics determine the future.

...quantum mechanics—the physics of our world—requires that you hold such pedestrian complaints in abeyance.

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.

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