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Toola is credited with showing researchers that captive otters could successfully raise orphaned pups for return to the wild.

Children with concussions — especially ones that led to unconsciousness or visible changes on MRI scans — were more likely than others to have lingering headaches, tiredness and trouble thinking.

The head of the International Atomic Energy Agency says Iran is still not providing enough cooperation with inspectors. The agency has tried twice to visit one particular Iranian military base and has been rebuffed.

Attorney General Eric Holder spoke in Chicago on Monday on the legal rationales for targeting and killing Americans suspected of terrorism overseas. Carrie Johnson talks to Melissa Block.

There's little dispute among educators that kids aren't reading as well as they should be. Now, a growing number of states are taking a hard-line approach, requiring that third-graders who can't read at grade level be automatically held back. But some worry that will do more harm than good.

In a speech Holder said due process doesn't necessarily come from a court.

After the pummeling he's taken in recent weeks at the hands of Mitt Romney and the former Massachusetts governor's superpac allies, who could fault Rick Santorum if he felt like he was strapped to the top of vehicle for a 12-hour trip to Canada.

In a final day of campaigning before Super Tuesday, Republicans Mitt Romney and Rick Santorum focused on the economy in Ohio, the most sought after prize of the 10 states voting or caucusing. A week ago, Santorum had a substantial lead in Ohio polls; now he's in a statistical dead heat with Romney.

In a speech at Northwestern University Law School, the attorney general said the president "may use force abroad against a senior operational leader of a foreign terrorist organization with which the United States is at war — even if that individual happens to be a U.S. citizen." That position bothers civil libertarians.

Several new startups are connecting people who need a car with strangers who want to make a few extra bucks renting theirs out. Wheelz is one such peer-to-peer car-sharing company. The Silicon Valley startup is gaining traction on college campuses in the Bay Area.