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Seth Barker of Maine Fresh Sea Farms checks a seaweed line. People have foraged wild seaweed off the Eastern Seaboard for centuries. But now a much more active effort to grow seaweed in the U.S. is afoot. Derek Davis/Portland Press Herald via Getty Images hide caption

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Derek Davis/Portland Press Herald via Getty Images

Seaweed On Your Dinner Plate: The Next Kale Could Be Kelp

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