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Geneticists found clues to a disease of iron storage in the remains of several Bronze Age inhabitants of what's now Rathlin Island in Northern Ireland. Chrisgel Ryan Cruz/Flickr hide caption

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Chrisgel Ryan Cruz/Flickr

The Centers for Disease Control and Prevention estimates that 86 million Americans over age 20 have abnormal blood sugar levels. Over the long run, that can seriously damage the eyes, nerves, kidneys and blood vessels. iStockphoto hide caption

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