Thirty years later, Cambodia’s “killing fields” are still haunting. A Buddhist memorial displays 5,000 haphazardly arranged human skulls — a tiny fraction of the 1.7 million Cambodians butchered by the Khmer Rouge. While the world must never forget what happened, there is at least the beginning of justice. On Monday, a United Nations-backed tribunal convicted Kaing Guek Eav, known as Duch, of war crimes and crimes against humanity — the first major Khmer Rouge figure to be tried since the regime was overthrown. He has already spent 16 years in prison, and the tribunal sentenced him to another 19 years.