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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.