James May celebrates the upcoming Doctor Who 50 years special explaining some of the science, and science-fiction, behind the workings of the Tardis, but most specifically what is a parallel universe.
Some physicists believe that in a parallel universe all of our mistakes have been corrected. Rather than taking a take away for one in a cold miserable flat, we are, in a parallel universe, living with our one true love having the best life ever. Outside our own universe, the theory goes, that there are an infinite number of other universes. However maybe we don’t have to travel beyond our universe to find a parallel. The Schrodinger’s Cat paradox basically is that a cat in a box with a device that can kill at random exists in both alive and dead states.