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A police officer is free on bond after being arrested following a rash of road-sign thefts in southeast Alabama.  Brantley Police Chief Titus Averett says officer Jeremy Ray Walker of Glenwood is on paid leave following his arrest in Pike County.  The 30-year-old Walker is charged with receiving stolen property.  Lt. Troy Johnson of the Pike County Sheriff's Office says an investigation began after someone reported that Walker was selling road signs from Crenshaw County.  Investigators contacted the county engineer and learned signs had been reported stolen from several roads.

NPR Politics presents the Lunchbox List: our favorite campaign news and stories curated from NPR and around the Web in digestible bites (100 words or less!). Look for it every weekday afternoon from now until the conventions.

Convention Countdown

The Republican National Convention is in 4 days in Cleveland.

The Democratic National Convention is in 11 days in Philadelphia.

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The Senate is set to approve a bill intended to change the way police and health care workers treat people struggling with opioid addictions.

My husband and I once took great pleasure in preparing meals from scratch. We made pizza dough and sauce. We baked bread. We churned ice cream.

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Police in Baton Rouge say they have arrested three people who stole guns with the goal of killing police officers. They are still looking for a fourth suspect in the alleged plot, NPR's Greg Allen reports.

"Police say the thefts were at a Baton Rouge pawn shop early Saturday morning," Greg says. "One person was arrested at the scene. Since then, two others have been arrested and six of the eight stolen handguns have been recovered. Police are still looking for one other man."

A 13-year-old boy is among those arrested, Greg says.

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For Sale: A Chunk Of Mars

Oct 12, 2012
Originally published on October 23, 2012 2:31 pm

Few things are as rare as a piece of rock that falls from outer space and crashes onto Earth.

Among the most prized of these meteorites are from Mars. Friday, scientists describe the latest one discovered: It's called Tissint, and this weekend you can buy a piece of it.

First, it's clear to experts that Tissint is extraordinary as well as extraterrestrial. It contains a unique story about Mars. Says meteoriticist Caroline Smith of the London Museum of Natural History: "Many people think that this meteorite may well be one of the most important meteorites that have actually fallen in the last century."

She's one of those people.

The museum owns the biggest piece of Tissint, and Smith is one of the scientists who described it in the journal Science on Friday.

Tissint's journey began as basaltic volcanic rock on the Martian surface. Smith says scientists can tell liquid washed over the rock and weathered it. It deposited elements from Martian soil inside cracks in the rock. Then an object — probably an asteroid — smacked into Mars and blasted the rock into space. In July 2011, it flamed through the Earth's atmosphere and smashed into the Moroccan desert.

Smith notes that while NASA's robot Curiosity is driving around Mars now, meteorite experts have the real thing.

"The thing is, no matter how fantastic the robotic missions are, it's still not the same as being able to actually analyze a piece of rock in a laboratory on Earth," she says. "So I think the big message here is that the meteorite is almost ground-truthing what we're actually seeing on Mars."

There are a few other Martian meteorites. But Tissint is special for several reasons. The impact that blew it off Mars melted part of its surface into smooth, black glass. That trapped bubbles of Martian atmosphere and elements inside, including cerium, an element scientists thought might be on Mars but weren't sure of. Also, its fragments were found quickly, so it hasn't been too contaminated by elements on Earth. It's also one of only five Martian meteorites that was observed hitting the Earth.

Scientists have just begun to tease out its story.

"Whenever I pick up a meteorite," says Smith, "I get excited. Each of those stones is a little time capsule and a little space probe to actually help us understand how our solar system formed."

But the piece in London is just one of many that broke off Tissint as it hurtled through Earth's atmosphere. Where they ended up is a story that begins in Morocco.

Meteorite scientist Hasnaa Chennaoui Aoudjehane at Hassan II Casablanca University had heard news of the fireball that lit up the sky in the summer of 2011. Last January she traveled 700 miles from Casablanca, over the Sahara, to find the "strewn field" — where pieces spread across the sand. She was not the first one there. "The first thing that I see is hundreds of people in the middle of nowhere. And this is something that I will never forget."

Men, women and children were camped out, hunting for the pieces. Meteorites are often found in North Africa — unusual rocks stand out in the desert — and they bring a good price.

People brought pieces to her to identify. "On the first view of the first sample, it's clear that it's a Martian meteorite," she says. Professional dealers scooped up most of the pieces. Aoudjehane bought some small pieces for her university in Casablanca, where laboratory tests confirmed what she'd recognized on sight — Martian rock. She's a co-author on the paper in Science.

About the time Aoudjehane was collecting pieces, a meteorite collector and dealer in New York City named Darryl Pitt got a tip about fragments of Mars for sale. Pitt, who is curator of the Macovich Collection of meteorites, got money from a group of investors. A Moroccan dealer sold him a piece, dispatching his au pair to fly with it to New York City. "Immediately after she clears customs, she reaches into her purse and gives me a packet and I'm looking around and looking at the cameras and thinking, 'Oh my golly, this is going to be a problem.' " Not that it was illegal; the transaction just made it look suspicious.

Pitt bought or brokered the sale of more pieces, including the one that went to the London's Natural History Museum. "It's important to make the material available to scientists and researchers first and foremost," he says. Collectors like Pitt have the time and means to cultivate contacts in places like Morocco, where the trade has flourished, especially among the Berber nomads. "Several of these fellows that I know have become rich. A couple own hotels now. They're no longer trekking the desert. ... it's been really fantastic."

The museum's Caroline Smith agrees that collectors and scientists do help each other — the collectors to find meteorites, the scientists to analyze them. "I would be not telling the truth if I said there was no tension with anything where large amounts of money is involved," she says. "But I would like to stress that, you know, on the whole relationships are very good, it's a mutually beneficial arrangement in many cases." The trade does push up prices, sometimes beyond what scientists can afford. But Smith says sometimes collectors sell them to museums at a discount.

On Sunday, a piece of Tissint will be offered at a meteorite auction in Manhattan. It's billed as the biggest ever, and Pitt helped Heritage Auctions arrange it. There are pieces from the moon and from the asteroid belt. But Pitt says the Martian meteorites are the stars because they are so rare. All told on Earth, he says, "You're talking like about 300 pounds of material. That's it. Mars is among the rarest substances on Earth."

The Tissint fragment at the auction starts at $230,000. As for potential buyers, Pitt says they're "most anyone who has an appreciation for the exotic, the romantic. Anyone who wants to enthrall a child or anyone's sense of wonder. Radio hosts? Everyone." Pitt notes that the piece at the auction actually fits exactly into the piece at the London museum. He's hoping whoever buys it will reunite the two.

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