Infants as young as six-months old grasp the complex interactions between a bully, a victim, and an intervening protector - and they root for the brave protector, researchers report this week in Nature Human Behaviour.

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Infants as young as six-months old grasp the complex interactions between a bully, a victim, and an intervening protector - and they root for the brave protector, researchers report this week in Nature Human Behaviour.