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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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Illicit drug use costs the United States approximately $181 billion every year.