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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.