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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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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.