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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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The horizontal fraction bar was introduced by the Arabs.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The average office desk has 400 times more bacteria on it than a toilet.