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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Medication errors are three times higher among children and infants than with adults.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.