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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 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.

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

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.

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.

This super cold air is usually whirling around the Arctic. But a big piece has plunged further south than normal. One way to think about what's happening: If a spinning ice skater extends her arms, she slows down. Sometimes, she wobbles and falls. The polar vortex has sort of stretched out an arm.

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.

Gravity and American Hustle led the Oscar nominations with 10 apiece, but it's tough to pick any winners from a lot of crowded fields.

Reversing a trend that dates back to the 1990s, the lobbying industry is becoming more secretive. And campaign money now looms ever larger as a critical element in the persuasion business.

The burden for retirement planning has shifted dramatically, from traditional pensions run by experts to 401(k)s that require decisions by "gravely undereducated investors, Vanguard founder John Bogle says. He says the government should set minimum standards to protect retirement plans.