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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The average office desk has 400 times more bacteria on it than a toilet.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.