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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.