Basically Google Glass is the fulfilment of a sort of promise that we'd have wearable computers in our eyeware someday. Goggle has already sold pairs of smart glasses to software developers ( for $1500, whereas they'll retail to consumers for 'significantly less' ) ahead of them being ready for consumers to purcharse. My question about these is this: The screen consists of a tiny square of transparent material, I wonder how breakable that key component is, and how easy it will be to replace?