Another mass killing has taken place, this time at a California facility for people with developmental disabilities. More than a dozen people are dead. What causes this madness? And what can and are we willing to do to stop it?

Robert Mendoza (@robertjmendoza), a forensic psychologist, and John Rosenthal, founder of Stop Handgun Violence, joined Jim to discuss the issues involved.

Marty Meehan (@martymeehan), the president of the University of Massachusetts, just marked five months on the job. He joined Jim to discuss the nation's reaction to the mass shooting in California.

WGBH’s Stephanie Leydon (@stephanieleydon) takes us inside a recovery high school.