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Vaccines prevent between 2.5 and 4 million deaths every year.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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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.