Do you believe that there are Parallel Universes?

This question is just for fun. I am not looking to start a war on here.
I am currently reading Dr. Kaku’s book Parallel Worlds.
I think this theory is very believable.
It kind of sounds like Science fiction but it may actually be reality.
Good Science Fiction extrapolations on Scientific possibilities
Has anyone read this book?
If the moderators allow my question we can have an interesting discussion.