Gena Asher speaks with NOVA senior executive producer Paula Apsell and NOVA writer-producer Doug Hamilton.
James Gray interviews Naomi Oreskes, professor of the History of Science and affiliated professor of Earth and Planetary Sciences at Harvard University.
Alexander McCall Smith has written more than sixty books, including the best-selling No. 1 Ladies' Detective Agency series.
James Burke is a science historian, author, and television producer best known for his BBC documentary series Connections.