Death of Osama bin Laden; Steven Levy

Guest host Brian Williams talks to NBC News correspondent Richard Engel about the death of Osama bin Laden and what it means for the war on terror. Presidential historian Doris Kearns Goodwin and journalists Bobby Ghosh of Time and Adam Gopnik of The New Yorker react to the news of bin Laden's death. Steven Levy of Wired shares his new book about Google, "In the Plex: How Google Thinks, Works, and Shapes Our Lives."