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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Excessive alcohol use costs the country approximately $235 billion every year.
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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.