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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.