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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.