Psychologists have generally ignored the role played by feelings, preferring more easily measurable processes such as memory and learning. But now social scientists are finally focussing on feelings, as evidence mounts about the power they exert over us. 1: Fear. It is 500 million years old but it is as potent today as it ever was: fear! In the openertothis five-part series, Claudia Hammond bravely explores the first Of the feelings.Producer Marya Burgess