Marc Dorfman

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Few places are dirtier than the checkstand conveyor belts at your local supermarket. Going round and round, year after year, conveyor belts may look clean, but they are actually a breeding ground for unwanted bacteria. Shoppers place billions of products on these contaminated belts, exposing foods — and families — to potentially harmful pathogens. For many Americans, the black conveyor belts have been around for as long as they can remember and for good reason:…