Tecahers are finding that devices that instantly register student answers to questions in class, change the dynamics of a class. “The devices, which the students call “clickers,” are being used on hundreds of college campuses and are even finding their way into grade schools. They alter classroom dynamics, engaging students in large, impersonal lecture halls with the power of mass feedback. Clickers ease fears of giving a wrong answer in front of peers, or of expressing unpopular opinions.”