President Biden urged Congress to act and the House is preparing to pass multiple gun control measures. But the Senate is where a compromise must be made. A bipartisan group of lawmakers is reportedly discussing policies like enhanced background checks and a federal red flag law. While it's unclear what Congress might agree to, researchers do have ideas about what policies could help prevent mass shootings and gun violence. NPR's Nell Greenfieldboyce explains. Hear more from her reporting on Short Wave, NPR's daily science podcast, via Apple, Google, or Spotify. NPR's Cory Turner reports on what school safety experts think can be done to prevent mass shootings, and former FBI agent Katherine Schweit describes where Uvalde police may have erred their active shooter response. Schweit is the author of Stop the Killing: How to End the Mass Shooting Crisis.Help NPR improve podcasts by completing a short, anonymous survey at npr.org/podcastsurvey. In participating regions, you'll also hear a local news segment to help you make sense of what's going on in your community.Email us at considerthis@npr.org.