About This Video

In recent years, a growing body of work—based on the principles of quantum mechanics, cosmology, and string theory—has been steadily converging around a proposal that our universe is actually only one of many universes. Here, Brian Greene explains how the mathematics behind string theory—the physicist’s area of expertise—only makes sense if we accept the existence of multiple dimensions beyond the ones we can currently perceive.

Recorded June 2010; Posted October 2010