New book: Fabric of the Cosmos: Space, Time and the Texture of Reality, Brian Greene.
Ten (or eleven) dimensions: nine (or ten) or space and one of time. The reality we see and feel isn't reality at all. I don't know. I always read this sort of thing when I'm feeling relentlessly down, physically, mentally and emotionally.
Not for the faint of mental focus, though. I do lots of backtracking.