Metaphysical speculation is independent of the physical validity of the Big Bang itself and is irrelevant to our understanding of it.

Teaching and writing, to me, is really just seduction; you go to where people are and you find something that they're interested in and you try and use that to convince them that they should be interested in what you have to say.

A universe without purpose should neither depress us nor suggest that our lives are purposeless. Through an awe-inspiring cosmic history we find ourselves on this remote planet in a remote corner of the universe, endowed with intelligence and self-awareness. We should not despair, but should humbly rejoice in making the most of these gifts, and celebrate our brief moment in the sun.

Keeping religion immune from criticism is both unwarranted and dangerous.

Nothing can create something all the time due to the laws of quantum mechanics, and it's - it's fascinatingly interesting.

What science is all about is a process. It's like saying, "Well, is it important for people to know that World War II happened?" Well it's part of what makes us who we are. And so, there's basic bits of science we need to know.

Empty space is a boiling, bubbling brew of virtual particles that pop in and out of existence in a time scale so short that you can't even measure them.