Matt Groening tells Smithsonian magazine that the show's location is based on Springfield, Ore. He credits the idea of naming it Springfield to the hit TV show Father Knows Best.

As Tulsa police sought suspects in last week's deadly shootings, black and white leaders urged the community to remain calm. The united front was just one indicator of how race relations have improved since the city's 1921 race riot, arguably the worst in U.S. history.

The attorneys for George Zimmerman have withdrawn as his counsel, saying they haven't heard from him since Sunday. Robert Siegel talks with Kathy Lohr about the announcement.

An Institute of Medicine panel says a tax of half a percent or so on medical transactions could help the nation's public health agencies tackle pressing goals, such as reducing adult obesity. In the long run, that could result in big savings in health care spending, the panel says.

Bobby Clark, 54, was one of three people killed in Friday's shootings in Tulsa, Okla. Friends and family say Clark, a resident of the city's Northgate neighborhood, was a well-liked musician who enjoyed sharing his music with others

Audie Cornish talks to Chris Benson, associate professor of journalism and African American studies at the University of Illinois-Urbana Champaign, about what constitutes a hate crime and what role it's playing in recent headlines.