Thinking for yourself has never been easy, but the question of whether it is still possible at all is of some moment. The key ideals of liberal democracy—moral independence and intellectual autonomy—depend on it, and my students will not have much experience of either if they end up living in a culture where all of their political and cultural opinions must express tribal allegiance to one of two partisan alternatives; where they live in communities so segregated by education, class, and race that they never encounter a challenge to their tribe’s received ideas, or in a society where the wells of information are so polluted that pretty well everything they read is “fake news”.