The implications of current mathematics lead to the radical notion that our universe is not all there is: It’s just one among many.

“These ideas are speculative,” says Columbia University physicist Brian Greene. “But if they’re right, this would be the greatest upheaval ever to our understanding of reality.”

In his latest book, “The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos,” Greene describes the recent discoveries in physics and cosmology that point to the existence of a multiverse.

We spoke in his spartan faculty office, decorated only with mathematical equations.

To read the interview, click here.