Mosh Pit Math: Physicists Analyze Rowdy Crowd

Fans in the mosh pit during the performance of Liturgy at the 2012 Pitchfork Music Festival in Union Park, Chicago, on July 14, 2012.
Fans in the mosh pit during the performance of Liturgy at the 2012 Pitchfork Music Festival in Union Park, Chicago, on July 14, 2012.