A running theme through the show Black Mirror are these small devices that people put on their temples. In one particular episode , an insurance rep is using the device, along with a little TV that shows what the person wearing the device is thinking, to get the details about someone getting hit by a delivery truck. I won't ruin the episode for you, but essentially someone tries to lie and they get caught because the insurance rep could see what they were thinking. How cool of a device would that be in real life?! The closest thing that humans have been able to come up with to detect deception thus far is the polygraph , which, although it's a cool device, doesn't do what it purports to do. The polygraph claims to be a lie detector test by measuring things like skin conductivity (sweat on your skin), heart rate, blood pressure, and breathing, and then the examiner interprets the results and...