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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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.
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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.