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Forty-seven Senate Republicans signed a letter to Tehran's leaders Monday questioning the authority of any agreement Iran might sign with President Barack Obama that is not ratified by Congress. And it's becoming an issue in the 2016 presidential campaign with potential Republican candidates signing onto the letter.

Tom Cotton, the freshman Arkansas senator behind the letter, even Tweeted a Farsi translation directly to the Iranian president and foreign minister.

.@HassanRouhani also, in case you need a translation... http://t.co/NVWL4PSFi1 pic.twitter.com/Je1ZBu1Cfp

— Tom Cotton (@SenTomCotton) March 9, 2015

The move has enraged Democrats. The hashtag #47traitors was trending on Twitter, and a petition to charge the senators as being in violation of the Logan Act has gotten more than the required 100,000 signatures for the White House to respond.

(By Thursday morning, it had more than 200,000 signatures. The White House, however, is likely to defer to the Department of Justice as it routinely does with petitions calling for legal action. See that Justin Bieber petition.)

The letter also comes a week after Israeli Prime Minister Benjamin Netanyahu addressed Congress about his reservations on a potential nuclear deal with Iran.

Kentucky Sen. Rand Paul, a likely 2016 contender, co-sponsored the prime minister's invitation and signed onto the letter to Iran, though he later denied in an interview with NBC's Today that he was trying to undermine the president in negotiating with Iran. Instead, he said he was actually trying "to strengthen the president's hand."

Jeb Bush and Scott Walker, leading early Republican primary polls, also expressed support for the senators.

.@marcorubio PAC looks to raise money off Iran letter. "Marco was proud to be one of the first senators to sign." pic.twitter.com/3mxhprf085

— Alex Leary (@learyreports) March 11, 2015

"The Senators are reacting to reports of a bad deal that will likely enable Iran to become a nuclear state over time," Bush said in a statement. "They would not have been put in this position had the Administration consulted regularly with them rather than ignoring their input."

Wisconsin Gov. Walker stressed that the president should seek congressional authorization.

"Unless the White House is prepared to submit the Iran deal it negotiates for congressional approval, the next president should not be bound by it," Walker said in his statement.

Florida Sen. Marco Rubio of Florida — who got into a heated back and forth with Secretary of State John Kerry Wednesday during a congressional hearing about Iran and fighting the so-called Islamic State – signed onto the letter. In a fundraising email, his PAC highlighted that he was "proud to be one of the first senators to sign."

Louisiana Gov. Bobby Jindal signed onto the letter after it was released.

I support the letter sent by @SenTomCotton & his colleagues to Iran warning them that Congress will have to approve any nuclear deal.

— Gov. Bobby Jindal (@BobbyJindal) March 10, 2015

Texas Gov. Rick Perry also said he "would be proud and honored to sign the letter." Perry linked to his video on Facebook about the nuclear threat Iran poses:

Jindal went a step further, saying anyone running for president "should sign on."

Post by Rick Perry.

"Every single person thinking about running for president, on both sides, should sign on to this letter to make clear to Iran that they are negotiating with a lame-duck president," Jindal said in a statement. "Make no mistake, any Iran deal that President Obama makes is not binding on a future president."

Of course, not every presidential contender agrees.

Former Secretary of State Hillary Clinton addressed the letter Monday at the beginning of a news conference designed to put aside a controversy of her own about a different form of written communication.

"Either these senators were trying to be helpful to the Iranians or harmful to the Commander-In-Chief in the midst of high-stakes international diplomacy," Clinton insisted. "Either answer does discredit to the letters' signatories."

Sen. Bernie Sanders of Vermont, who is likely to challenge Clinton, expressed his outrage on Facebook:

Vice President Biden, who's unlikely to run if Clinton does, is a longtime former member of the Senate, and called the letter "beneath the dignity of an institution I revere."

Post by Bernie Sanders.

The current officer holder, President Obama, hit back hard at Republicans Monday.

"It's somewhat ironic to see some members of Congress wanting to make common cause with the hardliners in Iran," Obama said of an open letter from Republicans who have questioned the prospect of a nuclear agreement. "It's an unusual coalition."

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Some startup entrepreneurs are leaving the high tech hot spots of San Francisco, New York and the Silicon Valley for greener pastures in a place that actually has greener pastures: Lincoln, Neb.

In fact, one of the secrets to the economic success of Lincoln, a city with one of the lowest unemployment rates in the country, is a surprisingly strong tech startup community that is part of what some in the region are calling the Silicon Prairie.

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Paul and Stephanie Jarrett are co-founders of the e-commerce platform Bulu Box, in Lincoln, Neb. David Schaper/NPR hide caption

itoggle caption David Schaper/NPR

Paul and Stephanie Jarrett are co-founders of the e-commerce platform Bulu Box, in Lincoln, Neb.

David Schaper/NPR

One of the, shall we say, middle-aged startups is an e-commerce platform called Bulu Box, started almost three years ago by Paul and Stephanie Jarrett.

It's a small company with nine full-time employees including the Jarretts, and a few interns.

"We are all about the open air office," says Paul Jarrett, as he shows off the cozy space on the second floor of an older downtown building.

And if the bright and vibrant office has a homey feel, there's a reason for that. "This is actually an apartment converted into an office space," he says.

There's a kitchen, laundry, showers, lockers, and a hangout room with couches, video games, board games, and adult beverages for those of legal drinking age.

But for Paul Jarrett, there's another reason his workspace feels like home.

"I actually grew up in a trailer park about four blocks from here," in downtown Lincoln, he says.

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While he dreamed of playing in the Nebraska Cornhuskers' football stadium, which is also just a few blocks from here, Jarrett earned a football scholarship to Iowa State and played there instead, starting at defensive nose guard.

He returned to Lincoln and then he and Stephanie moved away to New York for jobs in advertising and marketing, before going to work at tech startups in San Francisco.

"It's insane there," Jarrett says. "I couldn't get a cup of coffee without somebody telling me about their startup."

Nonetheless, Jarrett and his wife figured they'd need to stay in the Bay Area when they wanted to launch their own startup. But a friend told him about a network of technology investors back home, called Nebraska Angels.

He and Stephanie pulled all-nighters to put their plan together and made the long drive to Lincoln to make their pitch.

"Before we left town, we raised half a million dollars on our idea," he says.

So they loaded up a U-Haul and it was back to Lincoln they went, this time for good. And he immediately noticed a difference in the high tech business culture.

"In San Francisco and in big cities, people come up to you and they say, 'What do you do?' And they immediately start competing with you and they start sizing you up, and it's almost like they're saying, 'What can you do for me?' And in the Midwest, it is completely opposite. People say, 'How can I help you? What can I do for you?' "

For example, when Jarrett was setting up his office and needed Internet service, local providers told him it would be at least a couple of weeks. Then he ran into a friend on the street.

"And he's like, 'Oh, I know a guy.' He literally said, 'Follow me,' and he introduced me to these local guys that did Internet downtown and they're like, yeah, we could wire you up right now and they actually temporarily ran across the alley a cord just right into our office and within one hour we had Internet."

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Bulu Box is a small startup based in Lincoln, Neb. The e-commerce company provides boxes of healthy snacks, drinks, vitamins, supplements and other premium health care products. It then compiles data on what consumers like and don't like about those products for the companies that make them. David Schaper/NPR hide caption

itoggle caption David Schaper/NPR

Bulu Box is a small startup based in Lincoln, Neb. The e-commerce company provides boxes of healthy snacks, drinks, vitamins, supplements and other premium health care products. It then compiles data on what consumers like and don't like about those products for the companies that make them.

David Schaper/NPR

In the growing community of high tech entrepreneurs in Lincoln, as well as in nearby Omaha, people pull for one another. They collaborate, commiserate, advise and mentor. Even though they may compete for investors, talent and ideas, Jarrett says, there's a belief that any one startup's success is good for everyone else, especially in the same building.

In the office next door are 25-year-old startup "veterans" Blake Lawrence and Adi Kunalic and their newest company, Opendorse.

"Adi and I started our first company when we were 20 years old, five years ago, and there's been a ton of support ever since," Lawrence says.

Lawrence and Kunalic came to the University of Nebraska to play football, and the ties between college athletics and many tech startups in Lincoln are tight. An early connection was a company called Hudl, which was started almost a decade ago by three students in at the University of Nebraska-Lincoln's Raikes School of Computer Science and Management. They worked with Nebraska's football coach at the time to develop digital tools for coaches and players to share and store video and data, so they can review game and practice footage on laptops, tablets and smartphones.

Hudl has been named the fastest growing company in Nebraska for two consecutive years and now employs more than 225 people around the country, with most in offices in Lincoln and Omaha.

CEO and co-founder David Graff says the company could have moved anywhere, and had offers to relocate, but it stayed in Lincoln because "we really like the access to the University." Hudl has 35 interns and most are from the Raikes School (named for Nebraska alum and former Microsoft executive Jeff Raikes).

"We've had great support from the city," Graff adds. "A number of our investors come from the Lincoln area ... and we really like what's being built in Lincoln."

Graff points to the city's redevelopment of the Haymarket area, which is where Hudl is headquartered. Less than a decade ago, the area adjacent to downtown mostly consisted of neglected warehouses, dirty railroad tracks and the city's old rail depot.

The city and the university are also turning the old state fairgrounds into an innovation campus for high tech firms.

After starting and selling a social media company, Lawrence and Kunalic founded Opendorse, which uses data to help link athletes to marketers and the right endorsement opportunities.

Kunalic agrees the university provides access to "a lot of talent" and the small Midwestern locale helps keep a startup's costs down.

"I feel like [in] Lincoln, you can take a lot of risk and you can grow your team very fast and not have to pay ridiculous prices just to get your concept out the door," Kunalic says.

Lawrence, Kunalic, Jarrett and other entrepreneurs here admit lower salaries and Nebraska's sleepy reputation can make Lincoln a tough sell when going after top talent in places like Boston, New York, Seattle or San Francisco.

But Lincoln boosters say the low cost of living and high quality of life can be a draw. And a redevelopment of Lincoln's warehouse district downtown has dramatically increased the number of bars, restaurants and music venues, sparking a vibrant night life in this college town of nearly 300,000.

One of the latest to make the move is 30-year-old Matt Boyd, who arrived a few weeks ago from the Bay Area.

"I think there's a lot of people who in their mind, they think that innovation lives in San Francisco and hard work lives in San Francisco, especially for the startup scene and that's just not true," Boyd says. He says he's seeing "so many positive indicators of people who are super-duper innovators and are just churning and burning the midnight oil and almost a harder work ethic than I have seen anywhere."

Boyd and the other entrepreneurs note that access to capital can be a problem. There is some money available in the Midwest through Nebraska Angels and other similar investment groups, but Midwest investors tend to be a bit more conservative.

"That's why I keep my New York cell number," Bulu Box's Paul Jarrett quietly admits.

That way his calls are returned more often and more quickly. And after potential investors hear his business plan, they don't really care that he's not in the Silicon Valley, but on the Silicon Prairie in Lincoln, Neb.

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Few dishes showcase Southern tradition more perfectly than a slice of pecan pie, with its dark custard filling and crunchy, nutty topping.

Sweet and buttery, the pecans that figure so prominently in that iconic pie are America's only major indigenous tree nut. They're native to the Deep South, where the long, warm growing season provides an optimal climate. And they're the third-most-popular nut in the U.S. behind peanuts and almonds, according to the Agricultural Marketing Resource Center.

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Pecan flour from Oliver Farm in Georgia. Courtesy of Oliver Farm hide caption

itoggle caption Courtesy of Oliver Farm

Pecan flour from Oliver Farm in Georgia.

Courtesy of Oliver Farm

With 10 million pecan trees producing over 200,000 tons of pecans in America today, the nut hardly needs bolstering. But recently, it has become the focus of experiments by Southern farmers, chefs and craft breweries. Inspired in part by the fast-growing farm-to-table movement, which sets a premium on local products, they are giving the pecan new opportunities to shine in the form of cold-pressed oil, gluten-free flour and even beer.

Toasting or roasting brings nut oils to the surface, and pecans are practically overflowing: 75 percent of the nut is pure oil. Compare that with the peanut, which is 50 percent oil, and the almond, which is around 45 percent oil. As with all nuts, roasting not only intensifies the pecan's flavor but also it adds to its richness.

At Oliver Farm, an award-winning producer of artisan oils in Cordele, Ga., Clay Oliver uses an old-fashioned screw press to produce several thousand bottles of delicate pecan oil a year. He sells to Southern chefs, specialty stores around Georgia and online. "Pecans have that mysterious extra-something and an unforgettable flavor that renders the oil and flour delicious," says Oliver.

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Native Georgia chef Steven Satterfield, a James Beard Foundation Award finalist in 2013 and 2014, uses Oliver Farm's oil for everything from frying food to crafting pecan pesto vinaigrette at his Miller Union restaurant in Atlanta. "I love traditional Southern food," he says, "but I want to experiment just enough to keep it fresh and interesting and new."

Oliver Farm's defatted, gluten-free flour has earned such a big following of Southern bakers that it quickly sells out. Dede Wilson's Bakepedia, a baking and dessert recipe website, offers a recipe for pecan flour buttermilk pancakes with an added drizzle of pecan oil. Georgia chef Jennifer Booker, author of Field Peas to Foie Gras: Southern Recipes with a French Accent, uses the pecan oil in traditional southern shrimp and grits, and for sauteing collard greens.

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Lazy Magnolia's Southern Pecan Brown Ale is produced in Kiln, Miss. Courtesy of Lazy Magnolia hide caption

itoggle caption Courtesy of Lazy Magnolia

Lazy Magnolia's Southern Pecan Brown Ale is produced in Kiln, Miss.

Courtesy of Lazy Magnolia

But perhaps the most surprising new venue for the pecan is a craft beer called Southern Pecan Brown Ale, produced by Lazy Magnolia Brewing Company in Kiln, Miss. Founded by husband-and-wife team Mark and Leslie Henderson, it's the state's first brewery since the Prohibition.

"Our pecan ale is our flagship beer and the first one in the world made with whole roasted pecans," says Leslie Henderson. The beer won a Bronze Medal in the 2006 World Beer Cup and is now available in 17 southern states. "We were initially worried the oils would kill the foam on our beer," says Henderson. "But the pecans ferment just like a grain and provide nuttiness and flavor unmatched in other beers. There's still a lot of hops and malt, but the nutty flavor shines through."

What inspired the beer in the first place? "Comfort foods like pecan pie and pecan pralines give us that old, charming, Deep South romance," Henderson says. "We wanted to hearken back to that hospitality yet create something new. Our beer is complex but really approachable."

Pecan pancakes and beer for breakfast, anyone?

Jill Neimark is an Atlanta-based writer whose work has been featured in Discover, Scientific American, Science, Nautilus, Aeon, Psychology Today and The New York Times.

After spending nearly six months on the International Space Station, an astronaut and two cosmonauts have landed safely back on Earth. While in orbit, they traveled almost 71 million miles, NASA says.

Commander Barry Wilmore of NASA and flight engineers Alexander Samokutyaev and Elena Serova of the Russian Federal Space Agency (Roscosmos) touched down in Kazakhstan Thursday morning, local time.

The astronauts began their trip home by undocking a Soyuz TMA-14M spacecraft from the space station and undergoing a 4-minute, 41-second deorbit burn, NASA says. A parachute later eased the Soyuz craft down to the recovery area near the town of Zhezkazgan, Kazakhstan.

In the 167 days they were aboard the space station, the crew of Expedition 42 researched "the effects of microgravity on cells, Earth observation, physical science and biological and molecular science," NASA says.

The space agency adds that the space station now has an Electromagnetic Levitator, which will let scientists "observe fundamental physical processes as liquid metals cool," possibly leading to the production of "lighter, higher-performing" alloys.

The space station now has a three-person crew; a new trio will launch to join them in late March.

In other NASA news, the agency successfully tested what it calls the "largest, most powerful rocket booster ever built" Wednesday, producing some 3.6 million pounds of thrust during a two-minute burn at a test site in Utah. Temperatures inside the booster reached more than 5,600 degrees, NASA says.

The agency says the booster rocket is being developed "to help propel NASA's Space Launch System (SLS) rocket and Orion spacecraft to deep space destinations, including an asteroid and Mars."

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Expedition 42 Cosmonauts Elena Serova, left, and Alexander Samokutyaev, center, sit in chairs along with NASA astronaut Barry Wilmore, minutes after they landed back on Earth. Bill Ingalls/NASA hide caption

itoggle caption Bill Ingalls/NASA

Expedition 42 Cosmonauts Elena Serova, left, and Alexander Samokutyaev, center, sit in chairs along with NASA astronaut Barry Wilmore, minutes after they landed back on Earth.

Bill Ingalls/NASA

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