This week, a look back at our best moments of 2012: Jon Hamm dives into dark matter… Ed Asner answers your etiquette questions (and his cellphone)… We toast a historic Niagara fall… Folk rock icon Rodriguez rises from the dead… Alison Pill (“The Newsroom”) lists her favorite behind-the-scenes stories… Ramblin’ man Todd Snider recalls his brush with Nascar celebrity… And country singer Iris DeMent takes us home with a dinner party soundtrack…Plus “pretzel dumplings,” lucky underwear, and an OCD joke from James Franco.