National 2 professors, tracking patterns, try to predict who might carry out a mass shooting 6:26am May 30, 2022 National Share URL copied to clipboard! Play Pause There was an error loading the media player. Copyright 2022 NPR. To see more, visit https://www.npr.org. 300x250 Ad More Morning Edition Spain's Prime Minister Pedro Sánchez decides not to quit, after days of speculation National Should the U.S. government decide who qualifies as a gun dealer? by Rick Pluta 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate