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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.