The biggest strike in the country this year, and the biggest in the history of American universities, may be over-- after five weeks of picketing and protests, the union representing 48,000 grad student employees at the University of California announced a settlement offer by the university, and members are voting this week. Nelson Lichtenstein has our analysis.Also: For our holiday show, we want to talk about the Christmas Truce of World War I -- it’s a unique event in the history of modern warfare.  Adam Hochschild will explain.Plus, our Christmas music special: Bob Dylan fans have been puzzled and troubled by his Christmas album, “Christmas in the Heart”,  ever since he released it in 2009. To help figure out what Dylan was doing, we turned to Sean Wilentz--he’s the official historian at the official website BobDylan.com, and he also teaches American history at Princeton.