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When salmon are ready to leave the ocean and go back to their birthplace, they use magnetism to find their home river. But scientists fear fish born in hatcheries might have a poor sense of direction if they're raised in places surrounded by man-made objects that drown out the planet's natural magnetic field.

Obtaining the materials to make weapons-grade uranium or separated plutonium is harder than making a nuclear weapon, experts say. That's why the U.S. is engaged in a global effort to try to keep the specialized products out of hands it deems dangerous, like Iran.

Secretary of Defense Leon Panetta testified before a Senate committee Thursday about the September attack in Benghazi that killed the U.S. ambassador to Libya and three other Americans. Panetta was questioned about whether the U.S. response was fast enough and about why the U.S. military had not been better prepared for the possibility of an attack.

There was another U.S. drone strike in northwest Pakistan on Wednesday. At least three people were killed when missiles struck a compound in North Waziristan, near the border with Afghanistan. The strike comes as Washington debates the use of drones and not long after Ambassador Sherry Rehman said the use of drones was a violation of Pakistan's sovereignty and international law. Throughout Pakistan, popular reaction to the drone strikes continues to be vociferously negative. Robert Siegel talks to Jackie Northam.

The National Transportation Safety Board says the battery fire on a Boeing 787 Dreamliner was caused by multiple short circuits in a single cell, but it still doesn't know what caused the problem. The NTSB also says the process the FAA used to approve the plane needs to be reviewed.

President Obama addressed the House Democrats' retreat in Leesburg, Va., on Thursday to rally his troops ahead of a number of contentious issues. Audie Cornish talks to Tamara Keith.

Four out of five Americans were either directly or one stepped removed from unemployment. And many of them are seeing the glass half full.

The search for former Los Angeles police officer Christopher Jordan Dorner, who's suspected of killing a police officer and two other people, has stretched across a large area. It's feared he's intent on killing more officers.

Also: Geico's spokeslizard writes an advice book; Amazon patents the sale of used e-books; and a Stephen Colbert interview gets interesting.

From Pennsylvania and New Jersey north through New York State and into New England, blizzard and storm warnings are up. By the time the storm is over on Saturday, some places may have 3 feet of new snow.