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MELISSA BLOCK, HOST:

You can buy Twinkies on the cheap right now. Safeway, just around the corner from our office here in Washington, has them on sale - two boxes for five bucks. So the NPR Science Desk was inspired to take part in the fine, long-standing tradition of experimenting with Twinkies.

NPR's Allison Aubrey reports on their findings.

ALLISON AUBREY, BYLINE: My colleagues, Julie Rovner, our health policy correspondent, and Adam Cole, a new addition to our team, had one idea.

So, what is your experiment, guys?

Associate Attorney General Tom Perrelli will leave the third highest-ranking post at the Justice Department in March after nearly three years managing a bustling portfolio that has run the gamut from mortgage abuses and the oil spill in the Gulf of Mexico to stamping out domestic violence in Indian country.

As tensions rise between Iran and the West, Tehran has threatened to block the Strait of Hormuz, a transit route for one-fifth of the world's oil. Is it more than an empty threat?

"The simple answer is: Yes, they can block it," Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, said on CBS's Face the Nation on Jan. 8.

"They've invested in capabilities that for a short period of time block the Strait of Hormuz," he said.

"The Marine Corps is promising to investigate a disturbing web video that appears to show [four] Marines in Afghanistan urinating on the bloody corpses of [three] alleged Taliban fighters," Gannett Co.'s Marine Corps Times reports.

Running long-distance races isn't going to hurt your heart any more than other vigorous sports, researchers say. Just make sure you're fit enough to attempt the feat in the first place.

In the past decade, nearly 11 million runners participated in long-distance races, but only 59 suffered cardiac arrests, according to findings just published in the New England Journal of Medicine. Most of the cases happened to be in runners with undiagnosed, pre-existing heart problems.