In anaesthetist Dr Kevin Fong's television programmes he has often demonstrated the impact of extremes on the human body by using his own body as a 'guinea pig'. So Dr Fong is well placed to share his experience of the sheer audacity of medical practice at extreme physiological limits, where human life is balanced on a knife edge. Through gripping accounts of extraordinary events and pioneering medicine, Dr Fong explores how our body responds when tested by the extremes of heat and cold, vacuum and altitude, age and disease. He shows how science, technology and medicine have taken what was...