Someone falls hard in a crowded city square. With hundreds of people around, surely one of them will help. This episode examines the bystander effect, the finding that more witnesses can mean less help, starting with the 1964 murder of Kitty Genovese and the flawed New York Times claim of 38 silent witnesses that triggered a moral panic and inspired John Darley and Bibb Latane to coin diffusion of responsibility. The hosts walk through their five-step model of intervention, the smoke-filled room experiment, pluralistic ignorance, and the staged street fight where a single mention of marriage cut intervention from 65 percent to 19 percent.

The conversation then covers in-group effects with football jerseys, the chat room study where naming a specific user erased the effect, why workplace silence is often a calculated choice rather than a gli ...