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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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).
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.