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Gramoxone being sold at a local agriculture supply store in Hebron, Ohio on Dec. 15, 2016. Gramoxone contains paraquat and is manufactured by Syngenta. One of many pesticides that can’t be used in Europe but sold outside it, including in the United States, paraquat has been linked to Parkinson’s disease in a growing body of research. (Nathan C. Ward/The New York Times) - XNYT57