GUESTS: WILLIAM GIBSON author of Neuromancer, Mona Lisa Overdrive and Virtual Light. DAVID BRIN astronomer, professor and author of Foundation's Triumph, Infinity's Shore, and The Postman.

On the final day of Talk of the Nation, staff and colleagues have been faced with the dilemma of how to say goodbye. When your words fail, a greeting card can supply the right sentiment. Former Hallmark greeting card writer David Dickerson gives advice on saying goodbye.

In the final broadcast of TOTN, NPR senior Washington editor Ron Elving, senior business editor Marilyn Geewax and science correspondent Richard Harris discuss the big stories they're covering. Callers talk about the issues that have their communities and social circles abuzz.

The conflict in Syria rages on, the United States' relationship with Iran remains strained, and China is taking hold as an emerging superpower. As part of TOTN's "Looking Ahead" series, NPR commentator Ted Koppel looks to the future of international relations.

NPR's Neal Conan reflects on his 11 years of hosting Talk of the Nation and thanks some of the influential contributors to the show along the way. After 36 years at NPR, Conan signs off.