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Opportunity, NASA's Mars Rover, landed on Mars on Jan. 24, 2004. It was supposed to be a three-month mission, but 10 years later the rover is still investigating the red planet and sending data and images back to NASA. Jim Bell, an astronomer at Arizona State University, talks with NPR's Rachel Martin about Opportunity's decade on Mars.

A report by the New America Foundation found that information obtained from the NSA's phone metadata program spurred just 1.8 percent of the cases. Government claims of the spying programs success were "overblown," the study found.

The motivation for flying with other birds in V formation is probably to save energy, say researchers who tracked the pattern of wing flaps in an ibis flock. Each bird in the V catches a bit of lift from the bird ahead.

The .32-caliber weapon comes amid a spate of reports about rapes in the country. The gun is named for the victim of a 2012 gang rape and murder in New Delhi. But reaction to the Nirbheek has been mixed.

Although it may be uncomfortable for patients to learn that there are profound disagreements among doctors about medicine, these differences of opinion are common.

For a long time, archaeologists weren't sure what to make of the cookware excavated at ancient Mycenaean ruins in Greece. That is, until one researcher built replicas of the vessels to try to cook just like the Mycenaeans did.

The blaze at a complex that housed the elderly quickly engulfed much of the building. Investigators were having a hard time searching for victims because water used to fight the flames had frozen over the scene. A key question: Why was the complex only partially fitted with sprinklers?

The offer comes after anti-government demonstrations spread to cities where the citizens have shown support for the president. Meanwhile, the nation's justice minister has warned she may declare a "state of emergency" unless protesters leave her headquarters.

More than 2,000 vehicles were left on Atlanta's highways Tuesday when ice brought traffic to a standstill. Now authorities are taking drivers to their cars. The goal is to finally clear the roads.

Many of the canines that have flocked to Manhattan are staying at the Hotel Pennsylvania. And there the pooches are treated like VIPs — very important pooches, that is. From spinach pizza to a doggie concierge, it's a pampered life for a show dog.