Mathematicians used physics models and gymnasium experiments to understand why and pinpointed a specific “critical angle” of the crowd’s movement—13 degrees—to explain why crowded ...

Street maps aren’t always as logical as they look on paper. In several American cities, drivers face odd angles, sudden dead ...

That said, knowledge of this “chaos” angle would be more useful for civil planners and engineers than individual pedestrians, who can control their own behavior but not that of others.