Support WBURSheep, soldiers, and grains: Studying the physics of crowdsPlay06:47Download AudioAri DanielOctober 27, 2025 ShareA soccer match has just ended and a river of fans pours out of Pamplona's massive soccer stadium. When a mass of people like this start to move, the laws of physics — rather than free will — begin to take over. (For NPR)
