Scientists now believe there may really be a parallel universe - in fact, there may be an infinite number of parallel universes, and we just happen to live in one of them. These other universes contain space, time and strange forms of exotic matter. Some of them may even contain you, in a slightly different form. Astonishingly, scientists ...

Segment 1: A discussion about theoretical physics with Harvard professor Lisa Randall. Her book is called ''Warped Passages: Unraveling the Mysteries of The Universe's Hidden Dimensions''. Segment 2: We conclude with Harvard biology professor Edward O. Wilson. His latest book is ''The Creation: An Appeal to Save Life on Earth''.