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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.