The Hitchhiker's Guide to the Galaxy has, in what we laughingly call the past,
had a great deal to say on the subject of parallel universes. Very little of
this, however, is at all comprehensible to anyone below the level of Advanced
God and, since it is now well established that all known gods came into
existence a good three millionths of a second after the universe began rather
than, as they usually claimed, the previous week, they already have a great
deal of explaining to do as it is. They are, therefore, not available for
comment at this time.