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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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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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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.