Martha Brockenbrough, the founder of National Grammar Day and the Society for the Promotion of Good Grammar, tells host Rachel Martin about what she has referred to as an "apostrophe catastrophe." The U.S. Board on Geographic Names has a policy against possessive apostrophes in the names of places. The reason, The Wall Street Journal reports, is that the apostrophe quote implies private ownership of a public space.

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.