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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The horizontal fraction bar was introduced by the Arabs.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").