Theoretical mechanics: Crowd synchrony on the Millennium Bridge

@article{Strogatz2005TheoreticalMC,
  title={Theoretical mechanics: Crowd synchrony on the Millennium Bridge},
  author={Steven H. Strogatz and Daniel M. Abrams and Allan McRobie and Bruno Eckhardt and Edward Ott},
  journal={Nature},
  year={2005},
  volume={438},
  pages={43-44}
}
Soon after the crowd streamed on to London's Millennium Bridge on the day it opened, the bridge started to sway from side to side: many pedestrians fell spontaneously into step with the bridge's vibrations, inadvertently amplifying them. Here we model this unexpected and now notorious phenomenon — which was not due to the bridge's innovative design as was first thought — by adapting ideas originally developed to describe the collective synchronization of biological oscillators such as neurons… 

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