. >> woodruff: and we talk to pulitzer prize winning author stephen greenblatt about his new book, the story of the rediscovery of an ancient manuscript and its influence even today. >> one day, it is on the shelf and not instantly but decisively the world changes. >> woodruff: that's all ahead on tonight's newshour. mar funding for the pbs newshour has been provided by: >> growing up in arctic norway, everybody took fish oil to stay healthy. when i moved to the united states almost 30 years ago, i could not find an omega-3 fish oil that worked for me. i became inspired to bring a new definition of fish oil quality to the world. today, nordic naturals is working to fulfill our mission of bringing omega-3s to everyone, because we believe omega-3s are essential to life. >> at&t >> the william and flora hewlett foundation, working to solve social and environmental problems at home and around the world. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs