In a very original study on human-robot interaction, researchers at Carnegie Mellon University conducted a series of experiments to determine if people would be more willing to interact with a robot with human-like features as opposed to one without. The particular "behaviors tested were the ability to convey expression with a humanoid face and the ability to indicate attention by turning towards the person that the robot is addressing." This publication discusses the specifics of these experiments and the results. The basis of the study involved a robot asking a passerby if they would like to participate in a poll. Interestingly, both having a face and having tracking behavior effected how many people stopped to talk to the robot.