These 70 articles examine how warfare, human health and society interact. Topics include: the changing character of wars and the demographic consequences; medical/health aspects of weapons; health professionals in war; factors behind wars; violence; the arms trade; and regulation of modern war. When people are in danger, everyone has a duty to speak out. This book is a good example. Here the health profession shows its expertise in a responsible way. I hope their book can help us to change our way of thinking as well as our way of acting.