Bystanders will intervene in nine out of 10 public fights to help victims of aggression and violence reveals the largest ever study of real-life conflicts captured by CCTV. The findings overturn the impression of the ‘walk on by society’ where victims are ignored by bystanders. The consistent helping rate found across different national and urban contexts supports earlier research ‘suggesting that third-party conflict resolution is a human universal, with a plausible evolutionary basis.’