Can tyranny happen here? asks historian Timothy Snyder. His chilling answer is, "it can happen, it happens to people like us, and it is happening now." How can we fight back? Snyder offers 20 lessons; the first is the most important, as if we fail in this one it will be too late for the others: "Don't obey in advance. Most of the power of authoritarianism is freely given." Have the courage to take a stand--easy to say, but difficult to do.