Host Scott Simon speaks with New York Times classical music critic Anthony Tommasini about conductor James Levine's return to the Metropolitan Opera after a series of health problems kept him away for two years.

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.

Host Scott Simon talks to NPR's David Folkenflik about the Justice Department's seizure of phone records of Associated Press reporters and editors, and Bloomberg's secret monitoring of its sources' and customers' activities.

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.

Host Scott Simon talks to ESPN's Howard Bryant about the NBA playoffs, Washington Nationals outfielder Bryce Harper's collision with a wall, and David Beckham's retirement from soccer.

NPR's Ari Shapiro joins host Scott Simon to talk about the Obama administration's week. The president was buffeted by revelations that the IRS had targeted Tea Party groups seeking tax-exempt status and that the Justice Department had subpoenaed reporter phone records. On top of that, Republicans continue to allege that the White House engaged in a cover-up of talking points about the attack in Benghazi, Libya.

NPR's Peter Overby reports on the Congressional testimony of IRS officials in response to the scandal over special scrutiny of tea party groups. Underneath all the politics, there's a policy question that hasn't been addressed.

Host Scott Simon talks with NPR's Ofeibea Quist-Arcton about Zimbabwe's upcoming presidential election and efforts to alleviate its international isolation.

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.