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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.