Food For Thought : The Salt There's never been more interest in food and where it comes from and how it gets to your plate. This is the place for science, politics and the controversial topics that make you go "hmm."

A McDonald's billboard in St. Paul, Minn., advertises in the Hmong language. A new study of first- and second-generation Hmong and Karen immigrants finds their gut microbiomes changed soon after moving to the U.S. Education Images/UIG via Getty Images hide caption

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Education Images/UIG via Getty Images

Cottonseed is full of protein but toxic to humans and most animals. The U.S. Department of Agriculture this week approved a genetically engineered cotton with edible seeds. They could eventually feed chickens, fish — or even people. Courtesy of Lacey Roberts/Texas A&M University hide caption

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Courtesy of Lacey Roberts/Texas A&M University

Not Just For Cows Anymore: New Cottonseed Is Safe For People To Eat

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Allagash employees Salim Raal, left, and Brendan McKay stack bottles of Golden Brett, a limited release beer fermented with a house strain of Brettanomyces yeast. The Maine brewery recently installed solar panels as part of its sustainability initiatives. Derek Davis/Portland Press Herald via Getty Images hide caption

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Derek Davis/Portland Press Herald via Getty Images

The shells are trucked over to Brooklyn's Greenpoint neighborhood and once a month are brought en masse to Governors Island in the heart of the New York Harbor. Billion Oyster Project has collected more than 1 million pounds of oyster shells so far. Courtesy of Agata Poniatowski hide caption

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Courtesy of Agata Poniatowski

These soybeans were damaged in 2017 by dicamba, a popular weedkiller that's prone to drifting into neighboring fields. Some farmers in the state are defying efforts by regulators to strictly limit use of the chemical. Dan Charles/NPR hide caption

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Dan Charles/NPR

Despite A Ban, Arkansas Farmers Are Still Spraying Controversial Weedkiller

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Ancient Maya ruins at Tikal in northern Guatemala, near the border with Belize. Researcher Heather McKillop explains that Maya sites like Tikal could have been popular marketplaces to trade salt and other commodities. David DUCOIN/Gamma-Rapho/Getty Images hide caption

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David DUCOIN/Gamma-Rapho/Getty Images

Geoff Walser picks out a ristra, a wreath-like decoration made from dried chiles, to purchase at the annual Pueblo Chile and Frijoles Festival, which draws thousands of chile lovers from Colorado and beyond. Andy Cross/Denver Post/Getty Images hide caption

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Andy Cross/Denver Post/Getty Images

Jaap Korteweg, here in The Vegetarian Butcher's new restaurant, De Vleesch Lobby, says recreating the texture of meat "requires the patience of a monk and the best experts to achieve the right result." Thessa Lageman/NPR hide caption

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Thessa Lageman/NPR

At Shiru Cafe in Providence, R.I., students "pay" for coffee, but not with money. Chaiel Schaffel /Rhode Island Public Radio hide caption

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Chaiel Schaffel /Rhode Island Public Radio

The edges of this sycamore leaf are turned upward into a cuplike shape, the typical sign of exposure to dicamba. Dan Charles/NPR hide caption

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Dan Charles/NPR

A Drifting Weedkiller Puts Prized Trees At Risk

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Brian Wansink demonstrates his "bottomless bowl of soup" — used to show that people eat more when served in a bowl secretly replenished from the inside — after he was awarded a 2007 Ig Nobel Prize in 2007 at Harvard University. Wansink made a name for himself producing pithy, palatable studies that connected people's eating habits with cues from their environment. Stan Honda/AFP/Getty Images hide caption

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Stan Honda/AFP/Getty Images

Charlotte Gill, owner of Charlotte's Legendary Lobster Pound in Maine, says she believes that cannabis can calm crustaceans before they are tossed into boiling water. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

An industrial farm affected by flooding from Hurricane Florence in Duplin County, N.C. Jo-Anne McArthur/We Animals hide caption

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Jo-Anne McArthur/We Animals

A farmer in India piles millet in a field. Grains such as millet and sorghum pack a powerful nutritional punch, but they are overlooked for calorie-laden commodity crops such as wheat or maize. Sam Panthaky/AFP/Getty Images hide caption

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Sam Panthaky/AFP/Getty Images

Sampath, 63, planted these oil palm trees on his farm in Tamil Nadu, India, 12 years ago, but has yet to turn a profit. Sushmita Pathak/NPR hide caption

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Sushmita Pathak/NPR

Amid Palm Oil Boycott, India Wants To Produce More Of It

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A flooded farm stands next to the Lumber River on Monday in this aerial photograph taken after Hurricane Florence hit Lumberton, N.C. Charles Mostoller/Bloomberg /Bloomberg via Getty Images hide caption

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Charles Mostoller/Bloomberg /Bloomberg via Getty Images

Florence Engulfs Hog Farms And Chicken Houses, Thrashing North Carolina Agriculture

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Double Mountain Brewery founder Matt Swihart grabs freshly bottled pale ale from the bottling line in Hood River. The ale is among the first to be sold in Oregon's new refillable beer bottles. Cassandra Profita/OPB/Earthfix hide caption

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Cassandra Profita/OPB/Earthfix

Large fishing boats use voluminous trawl nets, longlines miles in length, and other industrial gear to catch fish on the high seas, which can destroy habitats and kill other sea life. Christopher Costello/NPR hide caption

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Christopher Costello/NPR

Gary Wagner, a blind Buffalo resident and subscriber to an app that connects him to a shopping assistant, looks for hot sauce at a Wegmans store in Amherst, New York. Ronald Peralta/WBFO hide caption

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Ronald Peralta/WBFO