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The two suspects in the Boston Marathon bombing were ethnically Chechen. The central Asian region of Chechnya has a troubled history. It has also seen some of that region's most notorious terrorist incidents in recent memory. Host Michel Martin learns more from Alexey Malashenko of the Carnegie Endowment for International Peace.

The relatively scarce "sweet wormwood" plant has long been the only source of the herbal drug artemisinin. A new trick for making artemisinin in the lab should help even out supplies around the world, scientists say, and cut the cost of malaria treatment.

The House Budget Committee chairman says the president's budget, which includes cuts to entitlements, amounts to an "olive branch" to Republicans.

Legislation introduced in several states would require anyone who records evidence of animal abuse to turn it over to authorities within a set period of time. But animal rights activists aren't welcoming these measures: They see the bills as veiled attempts to stifle long-term undercover investigations that can prove a pattern of abuse.

The assessment says such a weapon would probably not be very reliable. This is the first time the U.S. has concluded that Pyongyang's nuclear efforts have reached this point.

Mattel says its "Barbie Dolls of the World" typically come with a passport and "animal friend." It's had to respond to some criticism from this week from some who say the Barbie Mexico doll plays into stereotypes.

"Accidental Racist" launched an Internet firestorm and threatened to overshadow everything else on the country singer's fine new album, Wheelhouse. Even in that polarizing song, Paisley's biggest sin is that he's well-meaning in a way that topples too easily into sentimentality.

Clues are still being sifted — most notably, perhaps, from video that shows a man setting down a bag and leaving the scene. No arrests have been made. Thursday morning, President Obama is at an interfaith service in Boston where the victims will be remembered.

The Lee bothers, Matt and Ted, have written two cookbooks about Southern cuisine, but now they've turned their attention to a more specific region: Charleston, the city they grew up in. Their new book contains recipes and stories from a seafood-centric community with a rich culinary history.

FBI and SWAT teams are trying to locate a suspect in Monday's bombing at the Boston Marathon. The other suspect, his brother, was killed earlier in a shootout with police. Dr. David Schoenfeld of Beth Israel Hospital talks about Thursday night's police action in Watertown.