In this environment, sometimes it feels like the safest thing to do is just to stay silent. And that seems to be the approach more students are taking these days. A massive new survey of 37,000 college students reveals that more than 80 percent of them self-censor in the classroom, on campus and online. The survey forms the basis of the 2021 College Free Speech Rankings, produced by the Foundation for Individual Rights in Education (FIRE), RealClearEducation (my organization) and the research firm College Pulse.