Decoder Ring: What’s really going on inside a mosh pit? The mosh pit is “a violent place where (mostly) white guys vent their aggression.… but it’s also a place bound by camaraderie and—believe it or not—etiquette.… explore the unwritten rules of this 50-year-old live-music phenomenon with punks, concertgoers, and a heavy-metal physicist.” Hosted by Willa Paskin and produced by Paskin and Katie Shepherd.