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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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Your heart beats over 36 million times a year.
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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.