Are Mass Shootings Contagious in America?

Guest: Sherry Towers, Research Professor, Mathematical, Computational and Modeling Sciences Center, Arizona State University Twice in the last three weeks a man with a gun fired on a group of people. At a synagogue in Pittsburgh, 11 victims died. At a dance club in Thousand Oaks, 12 victims died. While mass shootings in which four or more people are shot or killed are not new in America, they are more frequently involving large numbers of victims. “Contagion” is the word some scientists have begun using to describe this acceleration.