When and why do people get involved in mass violence? What pushes individuals in a precariously tense region into brutality and blood — and what can prevent such slaughter? With gut-wrenching stories reaching us daily from Syria, Yemen, Sudan, South Sudan, North Korea, Central African Republic, Libya, Nigeria and Congo, that urgent public policy question is being tackled by a number of academics, researchers and policymakers, including the Early Warning Project, a public prevention system for mass atrocity and genocide that combines statistical modeling with insights from an expert opinion pool. A month ago, the EWP released a detailed risk assessment for such violence.