Technology

How Twitter's Trending Algorithm Picks Its Topics()  

Occupy Wall Street protesters meditate while a sign bearing their Twitter hashtag hangs from a railing in Zuccotti Park in October. Some activists accused Twitter of censorship because #OccupyWallStreet wasn't appearing on trending lists.

Sometimes a topic that seems hot, like Occupy Wall Street, doesn't appear on trending lists, leading some activists to accuse Twitter of censorship. But the secret algorithmic formula prefers stories of the moment to enduring hashtags, so it ignores topics that are popular over a long period of time.

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Environment

Can 'Carbon Ranching' Offset Emissions In Calif.?()  

Tall grasses in the San Joaquin valley in California suck carbon dioxide out of the air and store it in the soil. It's one option that environmentalists are pursuing for greenhouse gas "offsets" that can be bought and sold in the state.

Climate experts are thinking about growing dense fields of weeds to help soak up carbon dioxide from the atmosphere. This would require flooding dense, carbon-rich wetland soils of the San Joaquin Valley, and farmers hope money they make from capturing greenhouse gases would make up for the lost acreage.

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The Two-Way

Criminal Charges Still Pending In W.Va. Mine Disaster()  

After issuing a scathing report and reaching a $209 million settlement, officials are moving ahead on an internal probe of the agency that regulates mines and a federal criminal investigation of the disaster that killed 29 miners.

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The Two-Way

Trip To Dubai Raises Questions About Pakistani Leader's Future()  

President Asif Ali Zardari is in Dubai for heart treatment, his office says. But Zardari's government is embroiled in controversy. That has Pakistanis wondering if he might resign while he's out of the country.

President Asif Ali Zardari is there for heart treatment, his office says. But Zardari's government is embroiled in controversy. That has Pakistanis wondering if he might resign while he's out of the country.

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Your Money

In Policing Fashion, Moms Find A New Power Online()  

After J.C. Penney advertised a shirt many people found sexist, Lauren Todd launched an online petition. This screengrab was taken from Change.org, after J.C. Penney removed the shirt from its inventory.

When retailers go too far in trying to drum up sales, consumers turn to online petitions and social media campaigns to pressure them to change. Mothers are one group that's proven to be very powerful when attacking messages they consider to be sexist.

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Middle East

On The Run, Under The Radar, With Syria's Rebels()  

Riad al-Asaad says he's the leader of the Free Syrian Army, a group of Syrian defectors who recently posted this video on the group's Facebook page.

The Free Syrian Army, a ragtag force assembled by defecting Syrian soldiers, has built a sort of underground railroad to get weapons and people in and out of the locked-down country. NPR's Kelly McEvers spent an evening crossing the Lebanon-Syria border with a group of them.

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Asia

Clean Air A 'Luxury' In Beijing's Pollution Zone()  

Chinese walk to work midday as heavy smog hangs over downtown Beijing.

For more than half of the past 60 days, the air pollution in the Chinese capital has hit levels hazardous to human health. Experts estimate long-term exposure to such pollution could reduce life expectancy by as much as five years. NPR's Louisa Lim describes what it's like living in the city.

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House & Senate Races

Va. Senate Race: Familiar Faces, Fresh Pressure()  

Tim Kaine, a former Virginia governor and Democratic National Committee chairman, says his ties to President Obama will work both ways in the fall. "I'm sure the fact that I worked closely with the president is something that some people like and some people don't," he says.

Two former governors are facing off in a race that will help determine which party controls the Senate in 2013. Republican George Allen is doing his best to tie Democrat Tim Kaine to President Obama, who won the state in 2008 but is now struggling with Virginia voters.

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