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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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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.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.