Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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.
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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Municipal Solid Waste (MSW) Generation in the United States