A new lie detector out of the University of Utah uses a close analysis of your eye to tell if you're fibbing or not. Unlike polygraph tests, which measure things like blood pressure, pulse rate and respiration, this uses just the movement of your eye to see behind your lies.
Apparently, when you're lying, a your eyes move in a distinct way, the pupils dilating and responding differently than when you're telling the truth.
The whole thing is pretty reminiscent of the skinjob-detecting test in Blade Runner, although it's unclear if this version will be able to determine is someone is a robot or not. At the very least, it'll be able to determine if a robot is telling the truth, which is really half the battle.