A University of New Hampshire professor announced this week he's come close to solving a centuries-old problem proving something called the twin prime conjecture. We asked our math guy - Keith Devlin, of Stanford University - to join us, as he does now from their studios. Keith, thanks very much for being with us.
KEITH DEVLIN: Thanks, Scott. Nice to be with you again.
Six years ago, the FBI took on a challenge: To review what it called cold-case killings from the civil rights era. The investigation into 112 cases from the 1950s and 1960s is winding down, and civil rights activists are weighing the FBI's efforts.
The review comes with word this week of the death of a man who'd been named, by a newspaper investigation, as a possible suspect in one notorious case.
It's been a long slog already for the bipartisan immigration overhaul proposed by the Senate's Gang of Eight.
The legislation has been the target of more than 300 amendments during days of debate and votes by the Senate Judiciary Committee. But while the bill has largely held its own so far, its prospects for getting through Congress remain uncertain.
In Judiciary Committee Chairman Patrick Leahy's view, the immigration overhaul is "moving very well."
"It's moving a lot faster than people said it would," says Leahy, a Vermont Democrat.
For years, reports have suggested that Afghanistan is sitting on massive deposits of copper, gold, iron and rare earth minerals valued up to $3 trillion. This provides hope for a future economy that would not have to rely so heavily on foreign donations.
But with an uncertain political, regulatory and security environment, international investors are hesitant. And it could be many years before Afghanistan begins extracting its mineral wealth.
If you're driving down the road someday and you come across a camper with a 50-foot periscope sticking up into the sky, you just might have crossed paths with Ira Leifer. His quirky vehicle is on a serious mission. It's sniffing the air for methane, a gas that contributes to global warming.
Leifer is an atmospheric scientist at the University of California, Santa Barbara. But you'll more often find him off campus, in a garage, next to a string of auto body shops near the airport.
You can legally drink and drive in the United States, but there's a limit. In every state, drivers can't get behind the wheel if their blood alcohol content is .08 or higher, but the National Transportation Safety Board wants the states to lower the legal limit to .05 or even lower. Now, that would bring the United States into agreement with much of the rest of the world.
This is WEEKEND EDITION, from NPR News. I'm Scott Simon. There are three simultaneous controversies rattling the Obama administration this week: the IRS, the phone records of the AP reporters, and Benghazi. NPR's White House correspondent Ari Shapiro joins us. Ari, thanks for being with us.
This is WEEKEND EDITION from NPR News. I'm Scott Simon. Pair of unrelated stories this week, both involving the news media, served to remind a lot of Americans of how little information that we may assume to be private, really is private. One story involves the U.S. Justice Department's efforts to find out who reporters are talking to; the other, reporters secretly monitoring their sources' activities.
We're joined now by NPR media correspondent David Folkenflik, from New York. David, thanks for being with us.
In the seven years since her last album, Audra McDonald has kept busy. She spent several years in Hollywood, filming the television series Private Practice. She's gotten divorced and remarried, absorbed the shock of losing her father in a plane crash and watched her daughter, Zoe, grow up from a kindergartener to a middle-schooler.
France is officially the 14th country to legalize gay marriage. Saturday, President Francois Hollande signed a bill that Parliament had passed in April, which gives same-sex couples the right to marry and adopt.
Two Metro-North Railroad trains have collided on a stretch of track near Fairfield, Conn., causing a "major derailment" and "preliminary reports of injuries," according to the Metropolitan Transportation Authority.
[Update at 8:55 p.m. ET: The Associated Press quotes Connecticut officials as saying about 50 people have been hurt, four of them seriously.]
The British Foreign Office is happy to assist its citizens, but officials want to make clear that there are some requests they won't fulfill.
Such as supplying Olympic tickets or doing a background check on that Swedish woman you met online.
Those are just a few of the "often good natured" but distracting requests that the Foreign & Commonwealth Office (FCO) says it received over the past year, according to a press release issued Thursday.
It's Cinderella plus Jackie Robinson times two. When Venus and Serena Williams burst onto the lily-white world of tennis, they changed the game and made history: They were sisters. From a poor neighborhood. Who brought unprecedented power to the game. And both reached No. 1.
Their journey is the subject of a new documentary called Venus and Serena, showing in select theaters around the country.