Wal-Mart, The Who and a Brief History of Stampedes

I am endlessly fascinated by the science of crowds. Why do some crowds remain orderly and safe, while other, equally large and rowdy crowds become deadly? The death of a security guard working at Wal-Mart on Black Friday was a reminder of the importance of physics—and fairness. Check out my latest Time.com story on how to prevent a crowd crush.

Thanks to Dr. G. Keith Still, my go-to guy on the science of crowds.

GeneralAmanda Ripley