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Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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The human body produces and destroys 15 million blood cells every second.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Vaccines prevent between 2.5 and 4 million deaths every year.