Forty years ago, as the violence in Vietnam rained down on his village, an explosion killed Ho Van Thanh’s wife and two of his children. In fear and desperation, Thanh scooped up his infant son, Ho Van Lang, and fled into the jungle. For 4 decades, father and son lived far from civilization, carving a rudimentary life out of the land. Recently, villagers exploring some 25 miles from their homes happened upon the two. Thanh, now 82, was very ill, and the villagers reached out to help him.