Originally posted by the Voice of America.
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                   Group Identity May Prevent Human Stampedes

   Large gatherings are usually peaceful but sometimes turn unruly with
   deadly consequences. Last year's stampede during the Hajj in Saudi
   Arabia, for example, left more than 2,000 people dead. Psychologists
   say understanding how and why crowds sometimes behave as they do, and
   controlling them, involves recognizing people's capacity for
   self-regulation. VOA's George Putic reports.
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   [1]http://www.voanews.com/media/video/group-identity-may-prevent-human-
   stampedes/3150902.html

References

   1. http://www.voanews.com/media/video/group-identity-may-prevent-human-stampedes/3150902.html