Workers prepare burritos at a Chipotle Mexican Grill in New York. The restaurant chain has stopped serving pork in about one-third of its U.S. locations. Richard Levine/Demotix/Corbis hide caption

itoggle caption Richard Levine/Demotix/Corbis

After a turn in the tumbling machine, these conventional russet Burbank potatoes are starting to show signs of bruising. New GMO potatoes called Innate russet Burbanks have been bred not to bruise as easily as these. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

The city of Des Moines, Iowa, sits on the Raccoon and Des Moines rivers. The city's water works says it will sue three neighboring counties for high nitrate levels in these waterways. iStockphoto hide caption

itoggle caption iStockphoto

These "enriched cages" from the JS West farm in Atwater, Calif., in 2011 comply with the state's new law. They are larger and allow chickens to perch and lay eggs in enclosed spaces. Jill Benson/AP hide caption

itoggle caption Jill Benson/AP

Cows rotate in the milking parlor at Fair Oaks Farms, a large-scale dairy and tourist attraction, near Rensselaer, Ind. Dan Charles/NPR hide caption

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The Cornucopia Institute commissioned this photo of an organic egg producer in Saranac, Mich. According to Cornucopia, the facility is owned by Herbruck's Poultry Ranch, which has a license to maintain up to 1 million chickens on this site. Courtesy of The Cornucopia Institute hide caption

itoggle caption Courtesy of The Cornucopia Institute

Mattheos Koffas (left), a biochemical engineer at Rensselaer Polytechnic Institute, and Andrew Jones, a graduate student in his lab, with a flask of microbe-produced antioxidants. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

Samples of carrots cooked three ways are placed on a table for the kids at Walker-Jones Educational Campus, in Washington, D.C., to sample after they have finished lunch. The crowd favorite will later end up on the school lunch menu. Claire Eggers/NPR hide caption

itoggle caption Claire Eggers/NPR

An apiary on the outskirts of Chengdu, China, produces about 440 pounds of honey a day. American honey importers say they suspect the uptick in honey coming from Turkey actually originated in China. Liu Jin /AFP/Getty Images hide caption

itoggle caption Liu Jin /AFP/Getty Images

A tiny selection of the flavor compounds in pumpkin and pumpkin-pie spices is enough to make our brain think, "Ah, pumpkin pie!" when we drink a pumpkin pie latte. Ashley MacKinnon/Flickr hide caption

itoggle caption Ashley MacKinnon/Flickr

A global positioning receiver on the top of a combine harvester at a farm in Warwick, Md., in June. The equipment uses sensors and computers to help drive the combine along the route where the crops were planted, judge the composition of a crop and generate crop yield reports. Brendan Smialowski/AFP/Getty Images hide caption

itoggle caption Brendan Smialowski/AFP/Getty Images