BBC RADIO 4 BOOK OF THE WEEKSir Ranulph Fiennes has climbed the Eiger and Mount Everest. He's crossed both Poles on foot. He's been a member of the SAS and fought a bloody guerrilla war in Oman. And yet he confesses that his fear of heights is so great that he'd rather send his wife up a ladder to clean the gutters than do it himself.In Fear, the world's greatest explorer delves into his own experiences and those of others to try and explain what fear is, and how we feel it. With an enthralling combination of story-telling, research and personal accounts of his own struggles to overcome fear, Sir Ranulph Fiennes sheds new light on one of humanity's strongest emotions.