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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Everyone has one nostril that is larger than the other.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.