An image from a police body camera shows bystanders including Darnella Frazier, third from right, filming a Minneapolis police officer pressing his knee on George Floyd’s neck. Minneapolis Police Department via AP, File

The ‘bystander effect’ is real – but research shows that when more people witness violence, it’s more likely someone will step up and intervene

A game theory expert explains why a witness to a troubling situation who is in a group may feel a lesser sense of personal responsibility than a single individual.

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