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KELLY MCEVERS, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

AUDIE CORNISH, HOST:

During the presidential campaign, Donald Trump's outreach to black voters essentially came down to this.

(SOUNDBITE OF ARCHIVED RECORDING)

On a cold and windy day off the coast of Alabama, a team of researchers from Worcester Polytechnic Institute in Massachusetts gathers, conducting the first test outside a laboratory for a potential new solution to a challenging problem: cleaning oil spills from water.

The invention, the Flame Refluxer, is "very simple," says Ali Rangwala, a professor of fire protection engineering: Imagine a giant Brillo pad of copper wool sandwiched between layers of copper screen, with springy copper coils attached to the top.

The German city of Trier has never been particularly fond of its most famous son, Karl Marx, who helped turn communism into an ideology that changed the course of history.

Conservative and Catholic, the picturesque city on the French border took an ambivalent view of the radical revolutionary, born into a Jewish family in 1818.

There's a wall-long mural in the manufacturing area of SilencerCo, in West Valley City, Utah, that shows a crowd of people with muzzled mouths. One's holding a sign that says, "Fight the Noise." Another says: "Guns don't have to be loud."

As a leading manufacturer and seller of gun silencers — or suppressors, as they're more accurately called — SilencerCo wants to quiet guns. Congress may soon help in the effort.

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KELLY MCEVERS, HOST:

Republican House leaders are making last-minute changes to their health care proposal in a bid to woo more conservatives ahead of a vote scheduled for Thursday.

One of those changes would let states impose work requirements on some Medicaid recipients. A handful of states asked the Obama administration for that authority but were denied.

The biopic Selena tells the story of Mexican-American pop star Selena Quintanilla Perez, a Tejano music singer who made a rare crossover to mainstream American audiences. The movie debuted 20 years ago Tuesday, two years after the singer was killed by the former president of her fan club.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

AUDIE CORNISH, HOST:

For more now, we turn to NPR legal affairs correspondent Nina Totenberg. Hey there, Nina.

NINA TOTENBERG, BYLINE: Hi.

In the middle of the desert, hundreds of miles from the nearest city, 60,000 Syrians are camped out along the Syrian and Jordanian border in what has become one of the biggest and most desperate refugee settlements in the region. Few outsiders have ever seen it.

NPR visited an area near the camp last week in a trip organized by the Jordanian military.

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