Over the last 100 years there have been enormous developments in modern medicine, and a whole range of previously incurable illnesses can now be treated. Yet people's chances of living a long, healthy life still vary dramatically, according to which country they live in, their social status, housing, diet, and many other factors. This title examines the different systems of healthcare, and the many inequalities in medical provision, that exist around the world. Why do the same diseases kill more people in some places than others? How have the major threats to human health changed over the years? And what can be done in the future to make the world's population healthier? Includes fact boxes, 'debate' suggestions to stimulate discussion and 'viewpoints' to show people's conflicting views on the subject.