In this week's Sunday Conversation, host Rachel Martin speaks with Detective Sgt. Joe Matthews, who worked for decades on the Adam Welsh murder investigation in Florida. She will speak to him about how the case changed overtime, how it affected him personally and professionally, and how it feels to close a case that he worked on for so long.

Several high schools had to cancel their proms in 1963, during a time of tumultuous civil rights protests across the South, and in Birmingham, Ala., particularly. Fifty years later, some of those African-American students finally got the chance to dance the night away. Gigi Douban reports.

Host Rachel Martin talks with Levis archivist Lynn Downey about the brand's 140th anniversary this month.

The IRS has admitted it flagged tax-exemption requests from groups with "Tea Party" or "Patriot" in their names starting in 2010. But some liberal groups and journalism organizations say their applications also faced long delays during the same period.

The Model S from electric car manufacturer Tesla has been named Motor Trend Car of the Year. But the company's business model is under attack by a formidable foe: the National Automobile Dealers Association, one of the most powerful lobbying groups in Washington.

The U.S. Army Corps of Engineers says the tiny town of Newtok, Alaska, could be completely underwater by 2017. Its 350 residents must relocate or stay to face the floods, but a move is easier said than done.

This week, the National Transportation Safety Board recommended lowering the legal limit of blood alcohol content for drivers to .05 or even lower. Currently, it's illegal to drive in all states with a BAC of .08 or higher. Host Scott Simon speaks with Dr. Anthony Liguori of Wake Forest School of Medicine about alcohol's impact on driving ability.

NPR's Scott Simon talks to Connie Schultz, former columnist and Pulitzer Prize-winning journalist for the Cleveland Plain Dealer. Starting this summer, the paper's owners will be reducing home delivery to three days a week and making huge cuts in the newsroom staff.

University of New Hampshire professor Yitang Zhang announced this week that he has come close to solving a centuries-old problem: proving the twin prime conjecture. Host Scott Simon gets an explanation from Weekend Edition Math Guy Keith Devlin of Stanford University.

The bipartisan immigration overhaul proposed by the Senate's Gang of Eight has been the target of scores of amendments. So far, the bill has largely held its own, but its prospects for getting through Congress are uncertain.

With the death of a possible suspect in one notorious case, activists are weighing the FBI's efforts to tackle cases from the 1950s and '60s. Some are calling for a congressional hearing to see whether the FBI has done enough investigating.

Of all the current Washington scandals, the one involving the IRS appears to have the most staying power. It rolls into one package an agency many love to hate, partisan suspicions and the American appetite for conspiracies.

Authorities say one train derailed, colliding with a second train near Fairfield.

The new version of the DSM, the manual of psychiatric diagnoses, is already sparking criticism. But psychiatrists say it helps make sure they're all on the same page.

Authorities are revisiting a triple murder in the Boston suburb of Waltham. One of the victims may have been a friend of bombing suspect Tamerlan Tsarnaev. Tsarnaev would sometimes spar at the same mixed martial arts gym where the victim worked as an instructor.

The Ruth Ellis Center in Highland Park, Mich., is making an effort to meet its clients where they are — on the dance floor, specifically with the dance form known as "vogue." From there, the center can connect them with counseling, health services, tutoring and clean clothes.

President Obama's commencement speeches often seem more about the big-picture state of the union than do his State of the Union addresses, which read like to-do lists. And his assessment of where the country stands and where it's going has changed over the past four years.

President Obama's commencement speeches often seem more about the big-picture state of the union than do his State of the Union addresses, which read like to-do lists. And his assessment of where the country stands and where it's going has changed over the past four years.

A long week of scandal has been tough on more than just the White House. President Obama's allies are struggling with how to respond to their first taste of really bad news within the administration.

Gov. Pat Quinn has not said whether he will sign the bill after the state Senate approved the measure, which includes tough guidelines for who is eligible.