This week an assailant entered a church school in Nashville and shot and killed six people. This is just one of more than 130 mass shootings recorded in this country so far this year.

Meanwhile, the response in Washington has been predictable -- Democrats have called for an assault weapons ban, Republicans say we need more police.

Daniel Webster of the Johns Hopkins Center for Gun Violence Solutions has been studying the issue for more than 30 years. He joined Diane for a conversation that moves beyond the gridlock to talk about what a public health approach to the issue might look like.

Diane also talks to Christina Caron, reporter for the Well section at The New York Times, covering mental health and the intersection of culture and health care. They discuss her project on how the prevalence of gun violence has changed us.