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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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Everyone has one nostril that is larger than the other.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.