For over a generation, shocking cases of censorship at America's colleges and universities have taught students the wrong lessons about living in a free society. Drawing on a decade of experience battling for freedom of speech on campus, First Amendment lawyer Greg Lukianoff reveals how higher education fails to teach students to become critical thinkers: by stifling open debate, our campuses are supercharging ideological divisions, promoting groupthink, and encouraging an unscholarly certainty