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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.

Not Your Grandpa's RV: This Roving Lab Tracks Air Pollution

Atmospheric scientist Ira Leifer installed special air sensors on a camper, then drove from Florida to California, measuring methane levels all along the way. More than 6,000 readings later, he found some noticeable spikes, especially around petrochemical plants and urban areas like Los Angeles.

North Korea Fires Three Short-Range Missiles, Says The South

The launch comes at a time when tensions had been ebbing, following months of escalating tensions, including threats of nuclear strikes. All three missiles landed in the waters off the country's east coast.

Former bandmates Draco Rosa and Ricky Martin, seen here on stage at Univision's 2013 <em>Premio Lo Nuestro </em>awards celebration, reunite on Rosa's new album, <em>Vida</em>.

Draco Rosa: A Pop Survivor Returns From The Brink, With Friends

In the 1980s, he was Robi Rosa, the lead singer of Menudo at the boy band's peak of popularity. Rosa went on to write hits for bandmate Ricky Martin and develop a solo career. When Rosa was diagnosed with cancer several years ago, some of the biggest names in Latin music assembled to support him.

Amanda Knox enters an Italian court on Oct. 3, 2011, just before being acquitted of murdering her British roommate, Meredith Kercher.

'Waiting To Be Heard' No More, Amanda Knox Speaks Out

Less than two months into her study abroad program in Italy, Amanda Knox was accused and eventually convicted of murdering her roommate, Meredith Kercher. After her conviction was overturned, Knox returned home to Seattle — and now faces a potential retrial. Knox tells her story in a new memoir.

Amy Goyer moved back to Phoenix to look after her father, Robert, when he began to show signs of Alzheimer's. He is just one of 5 million Americans living with the disease.

Alzheimer's Cases Rise, But Hope Remains

More than 5 million Americans currently have Alzheimer's disease, and the number is only going to increase — in part, due to aging baby boomers. But researchers say increased awareness and early detection is helping patients live with the disease.

The Tesla Model S, Motor Trend Car of the Year, is introduced at the 2013 North American International Auto Show, in Detroit in January. Tesla's attempts to sell its cars without going through dealerships is meeting resistance.

Tesla Rides High, But Faces Formidable Foe: Car Dealers

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.

A column of Russia's T-90 tanks rumbles over the cobblestones in Moscow's Red Square on May 9 during the country's Victory Day parade celebrating the anniversary of its costly victory over Nazi Germany in World War II.

Russian Lawmakers: Don't Criticize Soviet Actions In WWII

Don't mess with Soviet history, especially when it comes to World War II. That's the message coming from some hard-line Russian legislators who are angry with an opposition lawmaker who criticized Josef Stalin's World War II counterintelligence agency, SMERSH, and likened it to Adolf Hitler's Gestapo.

Paris Saint-Germain's English midfielder David Beckham is thrown in the air by teammates.

WATCH: David Beckham Tears Up At Final Home Game

The storied midfielder walked off the pitch as fans — and former French President Nicolas Sarkozy — chanted his name.

Reports: Yahoo Board Approves $1.1 Billion Purchase Of Tumblr

The deal for the blogging site is designed to attract younger users to the ailing Web portal. The Wall Street Journal is basing its report on unnamed sources close to the situation.

The Movie Katie Aselton Has 'Seen A Million Times'

Actor-director Katie Aselton could watch Kathryn Bigelow's Point Break a million times. "It totally scoops you up and takes you for a ride," she says.

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