Of all the days since Pentecost, which day has done the most to change the world? How about July 4, 1776—the American Revolution, which ushered in a new era of freedom and prosperity? Or maybe July 14, 1789—the French Revolution, which was the beginning of the end for the great monarchies of Europe and exposed dark side of many revolutions, the Reign of Terror. Maybe October 25, 1917—the Russian Revolution, which led to untold misery and death for millions.