The size of our universe is nearly incomprehensible. It's so vast, the thought of anything greater is a little hard to swallow. But could there be a parallel universe out there? Could our universe be part of a grander whole, a multiverse?
Earlier this year, I had the opportunity to sit down with theoretical physicist Brian Greene, author of "The Hidden Reality" and "The Elegant Universe," in a previous episode of Talk Nerdy To Me. We talked nerdy about black holes and how the universe may be nothing more than a giant hologram. Now, we delve into the bizarre physics of the multiverse theory.