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Now, more on the long speech Carrie mentioned from Republican Senator Rand Paul of Kentucky. He's engaged in an old fashioned stand on the floor and talk till you can't filibuster. It began shortly before noon, aimed at blocking the president's nomination of John Brennan to head the CIA.

SENATOR RAND PAUL: I've chosen to make a stand on this one and not so much the person, but the principle of this. I have nothing personally against Brennan. I have nothing personal against the president.

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And I'm Melissa Block. It began around mid-day today, while wet snow fell on Washington D.C. Inside the Capitol building, a conservative Republican senator began to talk and talk - and talk. Rand Paul launched a filibuster to block the nomination of John Brennan for CIA director because of concerns over the administration's drone policies.

Researchers have discovered the remains of a giant camel in the far northern arctic regions of Canada. Scientists say today's modern can trace their origins back to these Canadian camels. Melissa Block speaks with scientist Natalia Rybczynski who wrote about the findings in the online journal Nature Communications.

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It's been nearly two months since a masked man in Moscow threw sulfuric acid in the face of the Bolshoi Ballet's artistic director, Sergei Filin. He suffered burns and his sight was damaged. Well, today, Moscow police announced they've arrested three men who have confessed to the crime and that includes a lead soloist with the Bolshoi.

The police released footage of the dancer after his arrest. He's 29-year-old Pavel Dmitrichenko.

PAVEL DMITRICHENKO: (Speaking foreign language)

Attorney General Eric Holder appeared before the Senate Judiciary Committee on Wednesday to answer questions on everything from gun control to the Department of Justice's failure to prosecute Wall Street. But he was also asked about an issue proponents of marijuana legalization have been following closely: what the DOJ plans to do about Colorado and Washington state, which have defied federal law by legalizing recreational use of the drug.

Arkansas has approved a law banning most abortions after 12 weeks of gestation, as both houses of the state's legislature vote to override a veto by Democratic Gov. Mike Beebe. The Republican-backed Human Heartbeat Protection Act will become the nation's most restrictive law.

In vetoing the Senate version of the bill Monday, Beebe said that it "would impose a ban on a woman's right to choose an elective, nontherapeutic abortion well before viability."

Scientists are beginning to understand how people tune in to a single voice in a crowded, noisy room.

This ability, known as the "cocktail party effect," appears to rely on areas of the brain that have completely filtered out unwanted sounds, researchers report in the journal Neuron. So when a person decides to focus on a particular speaker, other speakers "have no representation in those [brain] areas," says Elana Zion Golumbic of Columbia University.

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CLAUDIO SANCHEZ, BYLINE: This is Claudio Sanchez in Washington, D.C. By mid-afternoon, some parts of west and northern Virginia had gotten a foot of snow. Washington, D.C. was expecting at least half that, so area airports cancelled more than a thousand flights. Schools closed. So did federal and local government offices. Things look bad.

CHRIS VACCARO: This is certainly a significant storm and a dangerous storm.

SANCHEZ: That's Chris Vaccaro with the National Weather Service.

The next pope will be the spiritual leader of the world's Catholics. He will also be leading a multibillion-dollar financial empire. And from a business perspective, the Catholic Church is struggling.

We talked to several people who study the business of the church. Here are a few of the issues they pointed out.

1. Globally, the church's employees are in the wrong place.