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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The horizontal fraction bar was introduced by the Arabs.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.