Mitt Romney may consider the pair of primaries in Alabama and Mississippi on Tuesday an "away game," but Newt Gingrich is claiming a home court advantage.

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MELISSA BLOCK, HOST:

This is ALL THINGS CONSIDERED from NPR News. I'm Melissa Block.

ROBERT SIEGEL, HOST:

And I'm Robert Siegel. In Afghanistan today, a small breakthrough that may help avert a major crisis. U.S. and Afghan officials signed an agreement regarding the largest American-run prison in the country. This is the same prison where last month U.S. soldiers burned several copies of the Quran, setting off riots and reprisal attacks on Americans. NPR's Quil Lawrence reports from Kabul.

Greece's creditors agreed to take cents on the euro in the biggest debt swap in history.

This story broke Wednesday in the Anchorage Daily News, but it has too much going for it not to pass along.

Monday night while competing in Alaska's Iditarod dog sled race, Scott Janssen's 9-year-old husky Marshall collapsed.

"Janssen raced to the dog," the newspaper writes. "Marshall did not appear to be breathing."

"I know what death looks like, and he was gone. Nobody home," Janssen told the Daily News.

Reporting in Nature, researchers write they have deciphered the genetic code of the gorilla, the last of the great apes to have its genome sequenced. Study co-author Aylwyn Scally discusses what the data reveal about the evolution of humans and other apes.

The New Horizons Mission blasted off toward Pluto in 2006; it's on course to arrive in Pluto's neighborhood in 2015. Mission leader Alan Stern discusses the journey of the spacecraft, and why he thinks Pluto is still a planet. Plus, the mission to get Pluto on a commemorative stamp.

Reporting in Cell Metabolism, researchers write that when people who lead relatively sedentary lives worked out the DNA in their muscle fibers changed almost immediately. Scientists also found caffeine had the same effect on isolated rodent muscles. Study co-author Juleen Zierath discusses the DNA modifications.