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Did you know?
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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There are 20 feet of blood vessels in each square inch of human skin.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.