BBC Radio 4 begins a new series today on the fraught topic of intelligence. The focus of each of its three half-hour episodes is given by the series title: “Intelligence: Born Smart, Born Equal, Born Different.” The series is hosted by BBC4 science regular, Adam Rutherford. It will cover questions such as what intelligence is, how we have tried to measure it, what difference intelligence makes, and, most controversial of all, what relation intelligence may have to genetics.