Does a parallel universe exist?  Or possibly multiple parallel realities and space times?  Some people think so and this video goes into depth about the theory.  Here is some background on the discussion:

In 1954, a young Princeton University doctoral candidate named Hugh Everett III came up with a radical idea: That there exist parallel universes, exactly like our ­universe. These universes are all related to ours; indeed, they branch off from ours, and our universe is branched off of others. Within these parallel universes, our wars have had different outcomes than the ones we know. Species that are extinct in our universe have evolved and adapted in others. In other universes, we humans may have become extinct.

Let’s see what they have to say on this controversial debate in the video on page 2

Next Page »