People love science and all it offers, but they also feel a calling in themselves to the sense of what's deeper.

There's not a single shred of evidence for the multiverse. If, in order to explain this universe, you need a theory that invents an infinite number of parallel universes - that's not a very good theory.

Like most young physicists, when I was a kid enraptured with physics, I thought, "Everything can be explained by the theory of the atom!" But as I've gotten older, and I look at the world, I think there's a lot of ways in which that kind of building up from the smallest building blocks doesn't actually account for the world. As I've gotten older, I've also become sensitive to the ways - to all that is not amenable to explanation. Things that, even if you had an explanation, what good would it be?

Millennials, in particular, consider themselves to be spiritual, but they're not necessarily going to anybody's church. It's not like the world is becoming hardcore, Richard Dawkins-atheist, but people are looking to sort of synthesize science - people love science, especially the millennials.

People have been talking about multiverses as a philosophical idea for a long time. But the current incarnations in physics, I think, are more indicative of problems with some things going on at the frontier of physics than ideas that are gonna last.

I'm found of what's called emergence - as the universe gets more complex, new laws can emerge. Like evolution - there's things that you just aren't able to explain, even if you had an understanding of atoms.

Right now, culturally, we're seeing a really interesting evolution in ideas about spirituality and the world, right? The number of people who consider themselves to be religious and going to services is dropping, and the number of people who consider themselves to be spiritual but not religious is increasing.