Psychology
The Bystander Effect and Social Conditions of Collective Apathy
Quick fact
In a classic experiment, individuals were 88% likely to help a person in an emergency when alone, but only 31% likely when in a group of five people—showing that the presence of others dramatically reduces the chance that any one person will intervene.
Why this is interesting
You're in a crowded street when someone collapses. You wait, assuming someone else will help—but everyone does the same. Why does the crowd make you less likely to act?