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Eleanor Wachtel interviews American astronomer and science communicator Carl Sagan on hope and being human. They discuss his new book, Shadows of Forgotten Ancestors: A Search for Who We Are. Then, an interview with American-Canadian science fiction novelist William Gibson and a reading from his cyberpunk thriller novel, Virtual Light.

Interview with one of America's leading cognitive scientists, Steven Pinker. His last book, The Language Instinct, was a surprising bestseller. Now he's taken on an even more ambitious project - how the mind works.