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Republican Rick Santorum, the former senator from Pennsylvania, announced Wednesday that he is running for president.

"Working families don't need another president tied to big government or big money," he said in Cabot, Pa.. "And today is the day we're going to begin to fight back."

As candidates hit the campaign trail, NPR looks at four major issues the next president will face from Day 1 in office.

You can't tell by looking which students at Mount Sinai's school of medicine in New York City were traditional pre-meds as undergraduates and which weren't. And that's exactly the point.

Most of the class majored in biology or chemistry, crammed for the medical college admission test and got flawless grades and scores.

At Georgia's Fort Benning, female soldiers are fighting a two-month battle. Their enemies? Hunger, fatigue, even hallucination. They're fighting their way through the Army's notoriously hard Ranger School, trying to make history by becoming the first women to graduate from it.

It's one of several Pentagon experiments to see how best to move women into ground combat roles. And it's a test that thousands of men before them have failed.

License plate scanners have become a fact of life. They're attached to traffic lights, on police cars — even "repo" staff use them. All those devices have created a torrent of data, raising new concerns about how it's being stored and analyzed.

Bryce Newell's laptop is filled with the comings and goings of Seattle residents. The data comes from the city's license plate scanner, acquired from the police through public disclosure requests. He plugs in a license plate number, uncovering evidence of long-forgotten errands.

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