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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Illicit drug use costs the United States approximately $181 billion every year.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.