This device can tell doctors just how conscious you are

How conscious are you? It seems like an unanswerable question. But new research from the University of Cambridge claims to be able to measure exactly how conscious you are. 
The technique, developed by neuroscientist Srivas Chennu, combines classic EEGs with graph theory, a form of maths. With two simple pieces of equipment -- a cap covered in electrodes and a box that measures patterns of electrical activity, Chennu can measure the brain's "signature", which represents the ways