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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Your heart beats over 36 million times a year.
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.