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By Heidi Ledford of Nature magazine When the US Department of Agriculture (USDA) announced this month that it did not have the authority to oversee a new variety of genetically modified (GM) Kentucky bluegrass, it exposed a serious weakness in the regulations governing GM crops. [More]

Although it's known for its beautiful horse farms and as the "Thoroughbred Capital of the World," Lexington, Kentucky has gained a new distinction -- as the most sedentary city in the United States.