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In May, Lourdes walked across the bridge from Mexico to El Paso, Texas, and requested asylum. The first step is an interview with an asylum officer.

"I told him that I have the evidence on me," Lourdes said, through an interpreter. She told the asylum officer about the scar on her arm, and the four missing fingers on her left hand — all evidence, she says, of a brutal attack by a gang in her native Honduras.

But the asylum officer rejected her claim.

"I don't know what happened," Lourdes said. "I don't know how I failed."

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ARI SHAPIRO, HOST:

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The perfect home for a perfect television family is for sale.

(SOUNDBITE OF SONG, "THE BRADY BUNCH THEME SONG")

UNIDENTIFIED SINGERS: (Singing) Here's the story of a lovely lady...

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MARY LOUISE KELLY, HOST:

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I'm Ari Shapiro on Capitol Hill, where Senator Jeff Flake, Republican of Arizona, started the day trying to make a strong statement about the Senate's position on Russian interference in the 2016 elections.

(SOUNDBITE OF ARCHIVED RECORDING)

Most media outlets in Zimbabwe are state-run, and working as an independent journalist under Robert Mugabe came with serious risks. NPR's Ari Shapiro talks with Dumisani Muleya, editor-in-chief of The Zimbabwe Independent, about his hopes as a journalist now that Mugabe is out of power.

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When people think of particle accelerators, they tend to think of giant structures: tunnels many miles long that electrons and protons race through at tremendous speeds, packing enormous energy.

But scientists in California think small is beautiful. They want to build an accelerator on semiconductor chips. An accelerator built that way won't achieve the energy of its much larger cousins, but it could accelerate material research and revolutionize medical therapy.

First of all, what is an accelerator?

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