NASA's lunar monitoring program has detected <a href="http://science.nasa.gov/media/medialibrary/2013/05/16/impacts.jpg">hundreds of meteoroid impacts</a>. The brightest, detected on March 17, 2013, in Mare Imbrium, is marked by the red square.
In Moscow's Red Square, people still line up to visit Lenin's tomb. Though the Cold War is over, Russia and the U.S. keep watchful eyes on each other. Tuesday, Russian officials claimed to have uncovered a CIA spy.
The Cleveland story. The escape of three women who were kidnapped and held captive for 10 years has attracted notice around the world. Of course, it's also an all-consuming local story. And the Cleveland Plain Dealer provided continuous coverage along with in-depth profiles of the three women, the neighborhood where they were held captive, and the man who allegedly kidnapped them.
This weekend at Carnegie Hall, a giant returns to the podium. James Levine will lead the Metropolitan Opera Orchestra for the first time in two years after a string of health challenges from shoulder injuries to spinal problems. He's considered by at least one critic to be the most influential American conductor since Leonard Bernstein. That critic is Anthony Tommasini, lead classical musical critic for the New York Times.
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.
Ira Leifer, next to an RV he has outfitted with methane sensors and other equipment to sniff the air.
Credit Richard Harris / NPR
This map shows methane measurements Ira Leifer took as he drove in his RV around the Los Angeles basin. Notice the pronounced spike in levels of methane around the La Brea Tar Pits in the center of the image. Geological faults here allow "natural" methane to escape. The redder the color, the more methane was detected.
Credit Courtesy of Ira Leifer and Paige Farrell, et. al. / Published in Atmospheric Environment
Ira Leifer, at his garage-turned-lab in Santa Barbara, has been studying the levels of methane in the atmosphere.
Credit Richard Harris / NPR
Leifer stands atop his roving chemistry lab. He and his team took 6,600 methane readings on the cross-country drive from Florida to California.
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.