smartphones and PCs have infrared sensors that can track your eye movements. In fact, this industry is so popular it is worth half a trillion and expected to triple in the next 5 years. How your eye moves defines your interest and engagement and has been used to gauge what types of ads engages and influences people since the 80s. Today the tech has expanded so vast that it can be used from your phone, VRs, computers. We probably won't know the full scope of how this data is mined and used back on us. But the fact that everything can be tracked and likely without your permission is stifling