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An aging tree's girth is good for the planet, scientists say, because it helps it suck more carbon dioxide out of the air. "It's as if, on your favorite sports team, you find out the star players are a bunch of 90-year-olds," one ecologist says.

Raising the minimum wage, extending unemployment benefits and attacking income inequality are all on the Obama administration's domestic agenda. And they all fall under the purview of Labor Secretary Tom Perez, who has only been on the job since July.

An investigation into alleged drug use by officers led to evidence that some had also been sharing answers to proficiency exams, the Air Force says. The 34 who allegedly were involved have been suspended. It's the latest in a string of scandals for the nuclear missile launch command.

An education summit at the White House focuses on finding new ways to help poor students succeed. "The dirty little secret of American higher education is that universities care about racial diversity and do a good job of trying to promote that, but they completely ignore the issue of socioeconomic diversity," says one scholar.

Many spirits are tied to a particular place, but liquor companies have gone global and a small number of firms now dominate the market internationally.

The Marine Corps is looking into images obtained by the entertainment website TMZ. They appear to show U.S. Marines burning the corpses of Iraqi fighters during the 2004 battles in Fallujah.

VIDEO: On Jan. 17, 1961, Ike spoke to the nation about a military-industrial complex. He said "an alert and knowledgeable citizenry" must help safeguard security and liberty. Friday, exactly 53 years later, Obama will speak about surveillance programs that critics say threaten civil liberties.

The four Hezbollah members accused of killing former Prime Minister Rafik Hariri in 2005 are being tried in absentia. Prosecutors in Leidschendam, Netherlands, said Thursday they have pieced together mobile phone data allegedly used by the plotters. Hezbollah has denied any role in the killing.

In his new book, former Defense Secretary Robert Gates jabs Sen. Harry Reid for urging Defense Department research on irritable bowel syndrome. But the illness has been a plague on many Gulf War veterans.

Linguist Geoff Nunberg lives in the Mission and says young tech employees have been pouring into the neighborhood. But what to call these new residents? He says the term "techie" used to suggest a computer whiz with no social skills; now it suggests one with no social conscience.