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Ask people who buy organic food what they like about it, and chances are, most will say “they’re grown without pesticides.” As I’ve pointed out repeatedly, that’s not actually true. While organic farmers do not use synthetic pesticides, they do use a variety of chemicals to control insects and plant diseases — including such potentially dangerous substances as copper sulfate, rotenone, pyrethrum, ryania, and sabadilla. These “organic” pesticides are derived from minerals or plants, are lightly processed, and thus are…

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