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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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There are 60,000 miles of blood vessels in every adult human.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.