A study reveals ancient human teeth showing evidence that stressful events during early development are linked to shorter lifespans. Anthropologist George Armelagos led a systematic review of defects in teeth enamel and early mortality. He said: 'Prehistoric remains are providing strong, physical evidence that people who acquired tooth enamel defects while in the womb or early childhood tended to die earlier. During prehistory, the stresses of infectious disease, poor nutrition and psychological trauma were likely extreme. The teeth show the impact.' His paper is the first summary of prehistoric evidence for the Barker hypothesis -- the idea that many adult...