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http://www.npr.org/2016/08/15/488285360/the-physics-and-psychology-of-the-wave-at-sporting-events

"The wave" has been a popular diversion among spectators at stadium sporting events since at least the early 1980s, and over the years this pastime has caught the attention of physicists.

Illes Farkas, with the statistical and biological physics group of the Hungarian Academy of Sciences in Budapest, first began pondering the phenomenon in 2001.