Brian Greene's The Fabric of the Cosmos with its questions about the limits of space and time and the texture of reality certainly looks a bit daunting to the uninitiated. Cosmic ripples, 11 dimensions to the universe and string theory that is somehow connected to a "Theory of Everything" are all a bit alien if you never really got to grips with Newton, let alone Einstein. It might look very heavyweight, but Greene is an excellent communicator and what he's writing about is perhaps the greatest intellectual challenge we face.
There is no doubt that speculation about the nature of the heavens is very ancient. After centuries of thought "we still can only portray space and time as the most familiar of strangers". But enormous advances in understanding have been made especially over the last few decades. Whether we are high-flying city slickers or impoverished cattle-herders in the third world, speculation about space-time "takes on an almost mystical quality: we're considering the fate of the very things that dominate our sense of reality" according to Greene.