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There are 20 feet of blood vessels in each square inch of human skin.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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Thyroid conditions may make getting pregnant impossible.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.