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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).