Dr Sarah Brewer qualified from Cambridge University with degrees in Natural Sciences, Medicine and Surgery. After working in general practice and sexual health, she now specializes in health communication and is the author of 50 popular self-help books. Sarah was voted Health Journalist of the Year in 2002 and is also a registered nutritionist.Hugh Thomson is an unusual combination of writer, film-maker and explorer. Hugh has led many expeditions to Peru, starting in 1982 when he was 21, and has now become one of Britain's foremost modern explorers of Inca settlements. His recent memoir Tequila Oil: Getting Lost in Mexico describes his early experiences travelling through that country and his interest in the Maya.