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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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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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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

Bipolar disease. The term bipolar means “pertaining to two poles.” The individual with this form of Bipolar disease. The term bipolar means “pertaining to two poles.” The individual with this form of
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