Section 1: The biology and psychology of violence -- The roots of human aggression -- Secrets of the criminal mind -- How responsible are killers with brain damage? -- Strange but true: testosterone alone does not cause violence -- Violent pride -- War Is not part of human nature -- Section 2: Violent societies -- Wrath: how intimacy can breed violence -- Citizen militias in the U.S. are moving toward more violent extremism -- Where gun stores open, gun homicides increase -- Hollywood and gun violence -- Gun homicide linked to poor social mobility -- Income inequality's most disturbing side effect: homicide -- Section 3: Race and gender violence -- The deadly consequences of hypersexualizing Asian women -- Sexual victimization by women Is more common than previously known -- News about racial violence harms black people's mental health -- It shouldn't be taboo to publish images of those killed by violence -- Section 4: Police violence -- Why cops lose control -- Killings by police declined after Black Lives Matter protests -- What "less lethal" weapons actually do -- Police violence calls for measures beyond de-escalation training -- Three ways to fix toxic policing -- Section 5: How and how not to reduce violence -- Do prisons make us safer? -- Researchers model online hate networks in effort to battle them -- The problem with protesting violence with violence -- A gunman's regret -- Peace Is more than war's absence, and new research explains how to build It.