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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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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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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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