Multiverse: is this for real?

Mail & Guardian Online: "Yet another of my pens has just disappeared from where I swear I just left it and is probably already with my smug doppelganger in a parallel universe. We all have our favourite take on the existence of parallel worlds; it’s a subject that has been fodder for science-fiction writers for quite a while now. The question is whether the idea has a place in serious scientific discourse."