Writer and comedian Stephen Fry tells Philip Dodd about his journey across America in a black taxicab, which he has documented in a book and BBC ONE TV series. Philip also discusses if the historic divide between science and the arts is now being bridged, talking to celebrated biographer Richard Holmes, author of a book about the golden age of scientific discovery in the late 18th century, and mathematics professor Marcus Du Sautoy, who presents a series about mathematics on BBC FOUR. Plus the announcement of the winner of the 2008 Forward Prize for Poetry.