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Chemical weed killers have become a big part of mainstream, commercial agriculture, saving farmers time and back-breaking labor. But they also come with a cost, as loss of effectiveness forces greater use just to keep up. Now there’s a move afoot to add new patents to some of the old chemicals. When I was a kid, I worked next to my folks pulling weeds from around fences and buildings on the farmstead every Saturday afternoon. Those were the Read More …