One year ago, protesters across the Arab World began to rise up against autocratic rulers, forcing several from power. These revolutions have led to the region's biggest upheaval in decades. It's still not clear how these seismic changes will play out, and so far, the results have been mixed. In a six-part series, NPR is taking a look at where the region stands today. In the second installment, NPR's Lourdes Garcia-Navarro reports on how Islamists in Libya, long suppressed during Moammar Gadhafi's 42-year rule, are now able to operate freely.

Saudi Arabia said Monday that it will enforce a law that allows only females to work in women's lingerie and apparel stores, despite disapproval from the country's top cleric.

The 2006 law banning men from working in female apparel and cosmetic stores has never been put into effect, partly because of the views of hard-liners in the religious establishment, who oppose the whole idea of women working in places where men and women congregate, such as malls.

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There's a lot of debate these days about the cost of medical care and the risks. Is a drug for breast cancer patients worth the $100,000 price tag if it only adds a few months to a woman's life? Or should men routinely get blood tests for prostate cancer when the exam could cause more suffering than it prevents?

Well, today, a major medical group issued new ethical guidelines on whether doctors should consider cost when deciding how to treat patients. As NPR's Rob Stein reports, the group takes a provocative position.

Brazil had record trade figures in 2011, logging $256 billion in exports and maintaining a $29.7 billion surplus on the back of high commodity prices and strong Chinese demand, officials said Monday.

Exports to China hit $44.3 billion, an increase of more than 43 percent over 2010. In 2009 China surpassed the U.S. as Brazil's biggest trading partner.

"It was an exceptional year for Brazilian foreign trade," said Alessandro Teixeira, deputy trade minister, who said China represented 17 percent of Brazil's exports.

In the world of violins, the names Stradivari and Guarneri are sacred. For three centuries, violin-makers and scientists have studied the instruments made by these Italian craftsmen. So far no one has figured out what makes their sound different. But a new study now suggests maybe they aren't so different after all.

OK, here's a test. Clip one is a musical phrase from Tchaikovsky's Violin Concerto in D Major. Clip two is the same phrase. The same musician plays both. But one is on a Stradivarius violin, the other on a violin made in 1980. See if you can tell the difference.

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Today, police in Los Angeles arrested a man in connection with a string of more than 50 arson fires that have left that city on edge. Most of the fires were set in parked cars, and some spread to carports, garages and apartments. Sam Quinones is following the story for the Los Angeles Times and Sam, what else can you tell us about the man who's under arrest?