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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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There are more bacteria in your mouth than there are people in the world.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.