A malfunctioning vending machine at a Canadian university has inadvertently revealed that a number of them have been using facial recognition technology in secret.Earlier this month, a snack dispenser at the University of Waterloo showed an error message – Invenda.Vending.FacialRecognition.App.exe – on the screen.There was no prior indication that the machine was using the technology, nor that a camera was monitoring student movement and purchases. Users were not asked for permission for their f...