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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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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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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 more bacteria in your mouth than there are people in the world.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.