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There are 20 feet of blood vessels in each square inch of human skin.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.