Panic loves company. And yet calm is our practical, efficient, rational alternative. If you’re on a crowded plane and one person is freaking out about turbulence, the panic will eventually peter out. If, on the other hand, six people are freaking out, it’s entirely possible that it will spread and overtake the rest of the plane. Panic needs multiple nodes to spread. The same is true with a cabin of 10-year-olds at summer camp. One homesick kid usually comes around and ends up enjoying the summer, because being surrounded by others who are okay makes us okay. But three or four homesick kids can change the entire dynamic. While calm is a damping agent, it’s not nearly as effective at spreading itself as panic is. The library is usually a quiet place because the dominant cultural narrative in the library is to be quiet. Because it’s dominant, the coefficient of its spread is sufficient to keep it that way. We have to expend effort to create environments of calm...