A road in Ho Chi Minh City, Vietnam. | Godong/Universal Images Group via Getty Images The story of global health over the last few centuries has generally been one of great progress — vastly longer lifespans, far fewer women dying in childbirth, many fewer children dying from miserable diseases like measles and smallpox. But there is one often overlooked feature of modernity that has brought a new and enormous degree of mortality and injury to everyday life, a risk that falls most heavily on t