I won't pretend to understand this story, but it's fascinating to read nonetheless - the fact that the universe doesn't make sense with only four dimensions. Gravity, time, space, all of them point to other dimensions beyond what we can see and experience. I personally am a big fan of interdimensional mumbo-jumbo, the kind of stuff that blows your mind. So this article at MSN is right up my alley. May have to read it a few times to understand it, though.