Do you like the comic “Full metal alchemist”? Do you like the movie “Back to the future”?
If you like the theories in them, then you can visit the following links.
http://science.howstuffworks.com/parallel-universe.htm/printable

Review:
I felt very excited when reading that article. Because, I personally don’t believe the existence of the parallel world, or said that, if there is parallel world, it will not affect our world, it is just like our own imagine world. And from the article, said that the “String theory” get a negative result.