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

Art makes us human, music makes us human, and I deeply feel that science makes us human.

I was holding [my four-year-old daughter] and I said, 'Sophia, I love you more than anything in the universe.' And she turned to me and said, 'Daddy, universe or multiverse?'

Most scientists like to operate in the context of economy. If you don't need an explanatory principle, don't invoke it.

The idea that there could be other universes out there is really one that stretches the mind in a great way.

Over the centuries, monumental upheavals in science have emerged time and again from following the leads set out by mathematics.

It's hard to teach passionately about something that you don't have a passion for.