<ul><li>Physicist Denis Bartolo and his colleagues have studied the spontaneous motion of large crowds in a confined space.</li><li>By filming and analyzing the San Fermín festival, Bartolo aims to prevent stampedes in future events.</li><li>It may be possible to predict crowd movements once the density of people crosses a critical threshold.</li><li>Studying crowds is challenging due to safety concerns, but predictable events like San Fermín offer valuable research opportunities.</li></ul>

The Physics That Keeps a Crowd From Becoming a Stampede

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