There are 60,000 miles of blood vessels in every adult human.
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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
Attachment security correlates with later social competence.
Hormones acting through the brain help regulate metabolism and short- and long-term appetite.