East Africa: The dam that divides Ethiopians

Most people in Ethiopia's lower Omo River Valley continue to exist much as they have done for hundreds of years with virtually no concession to the 21st Century, with one disturbing exception: automatic weapons. Almost every male carries a Kalashnikov or an M-16 assault rifle, and what might in the past have been a fairly innocuous dispute over grazing or water-rights between different groups, now frequently escalates into bloody warfare.